diff --git a/crates/ruff_python_formatter/src/other/parameters.rs b/crates/ruff_python_formatter/src/other/parameters.rs
index 1c6682bab1..2e12f48456 100644
--- a/crates/ruff_python_formatter/src/other/parameters.rs
+++ b/crates/ruff_python_formatter/src/other/parameters.rs
@@ -241,6 +241,32 @@ impl FormatNodeRule<Parameters> for FormatParameters {
         let num_parameters = item.len();
 
         if self.parentheses == ParametersParentheses::Never {
+            // In a lambda, format any leading comments on the first parameter outside of the
+            // parameters group so that the parameters don't break. For example, format this input:
+            //
+            // ```py
+            // (
+            //     lambda
+            //     * # this becomes a leading comment on *x
+            //     x, **y:
+            //     x
+            // )
+            // ```
+            //
+            // as:
+            //
+            // ```py
+            // (
+            //     lambda
+            //     # this becomes a leading comment on *x
+            //     *x, **y: x
+            // )
+            // ```
+            if let Some(first) = item.iter().next()
+                && comments.has_leading(first.as_parameter())
+            {
+                leading_node_comments(first.as_parameter()).fmt(f)?;
+            }
             write!(f, [group(&format_inner), dangling_comments(dangling)])
         } else if num_parameters == 0 {
             let mut f = WithNodeLevel::new(NodeLevel::ParenthesizedExpression, f);
diff --git a/crates/ruff_python_formatter/tests/snapshots/format@expression__lambda.py.snap b/crates/ruff_python_formatter/tests/snapshots/format@expression__lambda.py.snap
index c489d18933..5997ff539a 100644
--- a/crates/ruff_python_formatter/tests/snapshots/format@expression__lambda.py.snap
+++ b/crates/ruff_python_formatter/tests/snapshots/format@expression__lambda.py.snap
@@ -539,15 +539,13 @@ def a():
 (
     lambda
     # comment
-    *x,
-    **y: x
+    *x, **y: x
 )
 
 (
     lambda
     # comment 2
-    *x,
-    **y: x
+    *x, **y: x
 )
 
 (