diff --git a/crates/uv-auth/src/keyring.rs b/crates/uv-auth/src/keyring.rs
index 4ee9e0ba5..e5969c438 100644
--- a/crates/uv-auth/src/keyring.rs
+++ b/crates/uv-auth/src/keyring.rs
@@ -84,6 +84,9 @@ impl KeyringProvider {
             return Ok(false);
         };
 
+        // Ensure we strip credentials from the URL before storing
+        let url = url.without_credentials();
+
         match &self.backend {
             KeyringProviderBackend::Native => {
                 self.store_native(url.as_str(), username, password).await?;
@@ -116,6 +119,9 @@ impl KeyringProvider {
     /// Only [`KeyringProviderBackend::Native`] is supported at this time.
     #[instrument(skip_all, fields(url = % url.to_string(), username))]
     pub async fn remove(&self, url: &DisplaySafeUrl, username: &str) -> Result<(), Error> {
+        // Ensure we strip credentials from the URL before storing
+        let url = url.without_credentials();
+
         match &self.backend {
             KeyringProviderBackend::Native => {
                 self.remove_native(url.as_str(), username).await?;
diff --git a/crates/uv/src/commands/auth/login.rs b/crates/uv/src/commands/auth/login.rs
index a0eff9b96..da1b2d66e 100644
--- a/crates/uv/src/commands/auth/login.rs
+++ b/crates/uv/src/commands/auth/login.rs
@@ -19,24 +19,6 @@ pub(crate) async fn login(
     preview: Preview,
 ) -> Result<ExitStatus> {
     let url = service.url();
-    let display_url = username
-        .as_ref()
-        .map(|username| format!("{username}@{url}"))
-        .unwrap_or_else(|| url.to_string());
-
-    let username = if let Some(username) = username {
-        username
-    } else if token.is_some() {
-        String::from("__token__")
-    } else {
-        let term = Term::stderr();
-        if term.is_term() {
-            let prompt = "username: ";
-            uv_console::username(prompt, &term)?
-        } else {
-            bail!("No username provided; did you mean to provide `--username` or `--token`?");
-        }
-    };
 
     // Be helpful about incompatible `keyring-provider` settings
     let Some(keyring_provider) = &keyring_provider else {
@@ -55,28 +37,85 @@ pub(crate) async fn login(
         }
     };
 
-    // FIXME: It would be preferable to accept the value of --password or --token
-    // from stdin, perhaps checking here for `-` as an indicator to read stdin. We
-    // could then warn if the password is provided as a plaintext argument.
-    let password = if let Some(password) = password {
-        password
-    } else if let Some(token) = token {
-        token
+    // Extract credentials from URL if present
+    let url_credentials = Credentials::from_url(url);
+    let url_username = url_credentials.as_ref().and_then(|c| c.username());
+    let url_password = url_credentials.as_ref().and_then(|c| c.password());
+
+    let username = match (username, url_username) {
+        (Some(cli), Some(url)) => {
+            bail!(
+                "Cannot specify a username both via the URL and CLI; found `--username {cli}` and `{url}`"
+            );
+        }
+        (Some(cli), None) => Some(cli),
+        (None, Some(url)) => Some(url.to_string()),
+        (None, None) => {
+            // When using `--token`, we'll use a `__token__` placeholder username
+            if token.is_some() {
+                Some("__token__".to_string())
+            } else {
+                None
+            }
+        }
+    };
+
+    // Ensure that a username is not provided when using a token
+    if token.is_some() {
+        if let Some(username) = &username {
+            if username != "__token__" {
+                bail!("When using `--token`, a username cannot not be provided; found: {username}");
+            }
+        }
+    }
+
+    // Prompt for a username if not provided
+    let username = if let Some(username) = username {
+        username
     } else {
         let term = Term::stderr();
         if term.is_term() {
-            let prompt = "password: ";
-            uv_console::password(prompt, &term)?
+            let prompt = "username: ";
+            uv_console::username(prompt, &term)?
         } else {
-            bail!("No password provided; did you mean to provide `--password` or `--token`?");
+            bail!("No username provided; did you mean to provide `--username` or `--token`?");
         }
     };
 
+    let password = match (password, url_password, token) {
+        (Some(_), Some(_), _) => {
+            bail!("Cannot specify a password both via the URL and CLI");
+        }
+        (Some(_), None, Some(_)) => {
+            bail!("Cannot specify a password via `--password` when using `--token`");
+        }
+        (None, Some(_), Some(_)) => {
+            bail!("Cannot include a password in the URL when using `--token`")
+        }
+        (Some(cli), None, None) => cli,
+        (None, Some(url), None) => url.to_string(),
+        (None, None, Some(token)) => token,
+        (None, None, None) => {
+            let term = Term::stderr();
+            if term.is_term() {
+                let prompt = "password: ";
+                uv_console::password(prompt, &term)?
+            } else {
+                bail!("No password provided; did you mean to provide `--password` or `--token`?");
+            }
+        }
+    };
+
+    let display_url = if username == "__token__" {
+        url.without_credentials().to_string()
+    } else {
+        format!("{username}@{}", url.without_credentials())
+    };
+
     // TODO(zanieb): Add support for other authentication schemes here, e.g., `Credentials::Bearer`
     let credentials = Credentials::basic(Some(username), Some(password));
     provider.store(url, &credentials).await?;
 
     writeln!(printer.stderr(), "Logged in to {display_url}")?;
-
     Ok(ExitStatus::Success)
 }
diff --git a/crates/uv/src/commands/auth/logout.rs b/crates/uv/src/commands/auth/logout.rs
index fe426f666..33eee7fa1 100644
--- a/crates/uv/src/commands/auth/logout.rs
+++ b/crates/uv/src/commands/auth/logout.rs
@@ -1,5 +1,6 @@
 use anyhow::{Context, Result, bail};
-use std::{borrow::Cow, fmt::Write};
+use std::fmt::Write;
+use uv_auth::Credentials;
 use uv_configuration::{KeyringProviderType, Service};
 use uv_preview::Preview;
 
@@ -16,13 +17,27 @@ pub(crate) async fn logout(
     preview: Preview,
 ) -> Result<ExitStatus> {
     let url = service.url();
-    let display_url = username
-        .as_ref()
-        .map(|username| format!("{username}@{url}"))
-        .unwrap_or_else(|| url.to_string());
-    let username = username
-        .map(Cow::Owned)
-        .unwrap_or(Cow::Borrowed("__token__"));
+
+    // Extract credentials from URL if present
+    let url_credentials = Credentials::from_url(url);
+    let url_username = url_credentials.as_ref().and_then(|c| c.username());
+
+    let username = match (username, url_username) {
+        (Some(cli), Some(url)) => {
+            bail!(
+                "Cannot specify a username both via the URL and CLI; found `--username {cli}` and `{url}`"
+            );
+        }
+        (Some(cli), None) => cli,
+        (None, Some(url)) => url.to_string(),
+        (None, None) => "__token__".to_string(),
+    };
+
+    let display_url = if username == "__token__" {
+        url.without_credentials().to_string()
+    } else {
+        format!("{username}@{}", url.without_credentials())
+    };
 
     // Unlike login, we'll default to the native provider if none is requested since it's the only
     // valid option and it doesn't matter if the credentials are available in subsequent commands.
diff --git a/crates/uv/src/commands/auth/token.rs b/crates/uv/src/commands/auth/token.rs
index e0bfb7f2d..a05464667 100644
--- a/crates/uv/src/commands/auth/token.rs
+++ b/crates/uv/src/commands/auth/token.rs
@@ -2,10 +2,11 @@ use std::fmt::Write;
 
 use anyhow::{Context, Result, bail};
 
+use uv_auth::Credentials;
 use uv_configuration::{KeyringProviderType, Service};
 use uv_preview::Preview;
 
-use crate::{Printer, commands::ExitStatus};
+use crate::{commands::ExitStatus, printer::Printer};
 
 /// Show the token that will be used for a service.
 pub(crate) async fn token(
@@ -15,6 +16,7 @@ pub(crate) async fn token(
     printer: Printer,
     preview: Preview,
 ) -> Result<ExitStatus> {
+    let url = service.url();
     // Determine the keyring provider to use
     let Some(keyring_provider) = &keyring_provider else {
         bail!("Retrieving credentials requires setting a `keyring-provider`");
@@ -23,21 +25,36 @@ pub(crate) async fn token(
         bail!("Cannot retrieve credentials with `keyring-provider = {keyring_provider}`");
     };
 
-    let url = service.url();
-    let display_url = username
-        .as_ref()
-        .map(|username| format!("{username}@{url}"))
-        .unwrap_or_else(|| url.to_string());
+    // Extract credentials from URL if present
+    let url_credentials = Credentials::from_url(url);
+    let url_username = url_credentials.as_ref().and_then(|c| c.username());
+
+    let username = match (username, url_username) {
+        (Some(cli), Some(url)) => {
+            bail!(
+                "Cannot specify a username both via the URL and CLI; found `--username {cli}` and `{url}`"
+            );
+        }
+        (Some(cli), None) => cli,
+        (None, Some(url)) => url.to_string(),
+        (None, None) => "__token__".to_string(),
+    };
+
+    let display_url = if username == "__token__" {
+        url.without_credentials().to_string()
+    } else {
+        format!("{username}@{}", url.without_credentials())
+    };
 
     let credentials = provider
-        .fetch(url, Some(username.as_deref().unwrap_or("__token__")))
+        .fetch(url, Some(&username))
         .await
         .with_context(|| format!("Failed to fetch credentials for {display_url}"))?;
 
     let Some(password) = credentials.password() else {
         bail!(
             "No {} found for {display_url}",
-            if username.is_some() {
+            if username != "__token__" {
                 "password"
             } else {
                 "token"
diff --git a/crates/uv/tests/it/auth.rs b/crates/uv/tests/it/auth.rs
index cbfc4c07f..9a87a1f8e 100644
--- a/crates/uv/tests/it/auth.rs
+++ b/crates/uv/tests/it/auth.rs
@@ -282,6 +282,41 @@ fn token_native_keyring() -> Result<()> {
     warning: The native keyring provider is experimental and may change without warning. Pass `--preview-features native-keyring` to disable this warning.
     ");
 
+    context
+        .auth_logout()
+        .arg("https://pypi-proxy.fly.dev/basic-auth/simple")
+        .arg("--username")
+        .arg("public")
+        .status()?;
+
+    // Retrieve token using URL with embedded username (no --username needed)
+    uv_snapshot!(context.auth_token()
+        .arg("https://public@pypi-proxy.fly.dev/basic-auth/simple")
+        .arg("--keyring-provider")
+        .arg("native"), @r"
+    success: false
+    exit_code: 2
+    ----- stdout -----
+
+    ----- stderr -----
+    error: Failed to fetch credentials for public@https://pypi-proxy.fly.dev/basic-auth/simple
+    ");
+
+    // Conflict between --username and URL username is rejected
+    uv_snapshot!(context.auth_token()
+        .arg("https://public@pypi-proxy.fly.dev/basic-auth/simple")
+        .arg("--username")
+        .arg("different")
+        .arg("--keyring-provider")
+        .arg("native"), @r"
+    success: false
+    exit_code: 2
+    ----- stdout -----
+
+    ----- stderr -----
+    error: Cannot specify a username both via the URL and CLI; found `--username different` and `public`
+    ");
+
     Ok(())
 }
 
@@ -299,7 +334,7 @@ fn token_subprocess_keyring() {
     ----- stdout -----
 
     ----- stderr -----
-    error: Failed to fetch credentials for https://****@pypi-proxy.fly.dev/basic-auth/simple
+    error: Failed to fetch credentials for public@https://pypi-proxy.fly.dev/basic-auth/simple
     "
     );
 
@@ -327,9 +362,9 @@ fn token_subprocess_keyring() {
     ----- stdout -----
 
     ----- stderr -----
-    Keyring request for __token__@https://public@pypi-proxy.fly.dev/basic-auth/simple
-    Keyring request for __token__@pypi-proxy.fly.dev
-    error: Failed to fetch credentials for https://****@pypi-proxy.fly.dev/basic-auth/simple
+    Keyring request for public@https://public@pypi-proxy.fly.dev/basic-auth/simple
+    Keyring request for public@pypi-proxy.fly.dev
+    error: Failed to fetch credentials for public@https://pypi-proxy.fly.dev/basic-auth/simple
     "
     );
 
@@ -341,14 +376,14 @@ fn token_subprocess_keyring() {
         .arg("subprocess")
         .env(EnvVars::KEYRING_TEST_CREDENTIALS, r#"{"pypi-proxy.fly.dev": {"public": "heron"}}"#)
         .env(EnvVars::PATH, venv_bin_path(&context.venv)), @r"
-    success: false
-    exit_code: 2
+    success: true
+    exit_code: 0
     ----- stdout -----
+    heron
 
     ----- stderr -----
-    Keyring request for __token__@https://public@pypi-proxy.fly.dev/basic-auth/simple
-    Keyring request for __token__@pypi-proxy.fly.dev
-    error: Failed to fetch credentials for https://****@pypi-proxy.fly.dev/basic-auth/simple
+    Keyring request for public@https://public@pypi-proxy.fly.dev/basic-auth/simple
+    Keyring request for public@pypi-proxy.fly.dev
     "
     );
 
@@ -361,14 +396,12 @@ fn token_subprocess_keyring() {
         .arg("public")
         .env(EnvVars::KEYRING_TEST_CREDENTIALS, r#"{"pypi-proxy.fly.dev": {"public": "heron"}}"#)
         .env(EnvVars::PATH, venv_bin_path(&context.venv)), @r"
-    success: true
-    exit_code: 0
+    success: false
+    exit_code: 2
     ----- stdout -----
-    heron
 
     ----- stderr -----
-    Keyring request for public@https://public@pypi-proxy.fly.dev/basic-auth/simple
-    Keyring request for public@pypi-proxy.fly.dev
+    error: Cannot specify a username both via the URL and CLI; found `--username public` and `public`
     "
     );
 }
@@ -618,6 +651,62 @@ fn logout_native_keyring() -> Result<()> {
     Logged out of public@https://pypi-proxy.fly.dev/basic-auth/simple
     ");
 
+    // Login again
+    context
+        .auth_login()
+        .arg("https://pypi-proxy.fly.dev/basic-auth/simple")
+        .arg("--username")
+        .arg("public")
+        .arg("--password")
+        .arg("heron")
+        .arg("--keyring-provider")
+        .arg("native")
+        .assert()
+        .success();
+
+    // Logout with a username in the URL
+    uv_snapshot!(context.auth_logout()
+        .arg("https://public@pypi-proxy.fly.dev/basic-auth/simple")
+        .arg("--keyring-provider")
+        .arg("native"), @r"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+
+    ----- stderr -----
+    Logged out of public@https://pypi-proxy.fly.dev/basic-auth/simple
+    ");
+
+    // Conflict between --username and a URL username is rejected
+    uv_snapshot!(context.auth_logout()
+        .arg("https://public@pypi-proxy.fly.dev/basic-auth/simple")
+        .arg("--username")
+        .arg("foo")
+        .arg("--keyring-provider")
+        .arg("native"), @r"
+    success: false
+    exit_code: 2
+    ----- stdout -----
+
+    ----- stderr -----
+    error: Cannot specify a username both via the URL and CLI; found `--username foo` and `public`
+    ");
+
+    // Conflict between --token and a URL username is rejected
+    uv_snapshot!(context.auth_login()
+        .arg("https://public@pypi-proxy.fly.dev/basic-auth/simple")
+        .arg("--token")
+        .arg("foo")
+        .arg("--keyring-provider")
+        .arg("native"), @r"
+    success: false
+    exit_code: 2
+    ----- stdout -----
+
+    ----- stderr -----
+    error: When using `--token`, a username cannot not be provided; found: public
+    ");
+
     Ok(())
 }
 
@@ -666,7 +755,7 @@ fn logout_token_native_keyring() -> Result<()> {
 }
 
 #[test]
-fn login_url_parsing() {
+fn login_native_keyring_url() {
     let context = TestContext::new_with_versions(&[]).with_real_home();
 
     // A domain-only service name gets https:// prepended
@@ -758,4 +847,79 @@ fn login_url_parsing() {
 
     For more information, try '--help'.
     ");
+
+    // URL with embedded credentials works
+    uv_snapshot!(context.auth_login()
+        .arg("https://test:password@example.com/simple")
+        .arg("--keyring-provider")
+        .arg("native"), @r"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+
+    ----- stderr -----
+    Logged in to test@https://example.com/simple
+    ");
+
+    // URL with embedded username and separate password works
+    uv_snapshot!(context.auth_login()
+        .arg("https://test@example.com/simple")
+        .arg("--password")
+        .arg("password")
+        .arg("--keyring-provider")
+        .arg("native"), @r"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+
+    ----- stderr -----
+    Logged in to test@https://example.com/simple
+    ");
+
+    // Conflict between --username and URL username is rejected
+    uv_snapshot!(context.auth_login()
+        .arg("https://test@example.com/simple")
+        .arg("--username")
+        .arg("different")
+        .arg("--password")
+        .arg("password")
+        .arg("--keyring-provider")
+        .arg("native"), @r"
+    success: false
+    exit_code: 2
+    ----- stdout -----
+
+    ----- stderr -----
+    error: Cannot specify a username both via the URL and CLI; found `--username different` and `test`
+    ");
+
+    // Conflict between --password and URL password is rejected
+    uv_snapshot!(context.auth_login()
+        .arg("https://test:password@example.com/simple")
+        .arg("--password")
+        .arg("different")
+        .arg("--keyring-provider")
+        .arg("native"), @r"
+    success: false
+    exit_code: 2
+    ----- stdout -----
+
+    ----- stderr -----
+    error: Cannot specify a password both via the URL and CLI
+    ");
+
+    // Conflict between --token and URL credentials is rejected
+    uv_snapshot!(context.auth_login()
+        .arg("https://test:password@example.com/simple")
+        .arg("--token")
+        .arg("some-token")
+        .arg("--keyring-provider")
+        .arg("native"), @r"
+    success: false
+    exit_code: 2
+    ----- stdout -----
+
+    ----- stderr -----
+    error: When using `--token`, a username cannot not be provided; found: test
+    ");
 }