diff --git a/.changeset/skip-supports-feature.md b/.changeset/skip-supports-feature.md
new file mode 100644
index 000000000000..b5dc0bbe4e57
--- /dev/null
+++ b/.changeset/skip-supports-feature.md
@@ -0,0 +1,5 @@
+---
+"@biomejs/biome": patch
+---
+
+fix(css): skip `useGenericFontNames` rule in `@supports` feature declarations
diff --git a/crates/biome_css_analyze/src/lint/a11y/use_generic_font_names.rs b/crates/biome_css_analyze/src/lint/a11y/use_generic_font_names.rs
index 45b270864de8..c8dccabf96ca 100644
--- a/crates/biome_css_analyze/src/lint/a11y/use_generic_font_names.rs
+++ b/crates/biome_css_analyze/src/lint/a11y/use_generic_font_names.rs
@@ -27,6 +27,7 @@ declare_lint_rule! {
     /// - Property with a keyword value such as `inherit`, `initial`.
     /// - The last value being a CSS variable.
     /// - `font-family` property in an `@font-face` rule.
+    /// - Properties inside an `@supports` feature declaration (used for feature testing).
     ///
     /// ## Examples
     ///
@@ -88,6 +89,12 @@ impl Rule for UseGenericFontNames {
             return None;
         }
 
+        // Ignore `@supports` feature declarations since they test for browser support,
+        // not actual font usage. e.g: @supports (font: -apple-system-body) { ... }
+        if is_in_supports_feature_declaration(node) {
+            return None;
+        }
+
         let is_font_family = property_name == "font-family";
         let is_font = property_name == "font";
 
@@ -158,6 +165,14 @@ fn is_in_font_face_at_rule(node: &CssGenericProperty) -> bool {
         .is_some_and(|n| matches!(n, AnyCssAtRule::CssFontFaceAtRule(_)))
 }
 
+/// Check if the property is inside an `@supports` feature declaration.
+/// Properties in @supports conditions test for browser support, not actual font usage.
+fn is_in_supports_feature_declaration(node: &CssGenericProperty) -> bool {
+    node.syntax()
+        .ancestors()
+        .any(|n| n.kind() == CssSyntaxKind::CSS_SUPPORTS_FEATURE_DECLARATION)
+}
+
 fn is_shorthand_font_property_with_keyword(properties: &CssGenericComponentValueList) -> bool {
     properties.into_iter().len() == 1
         && properties
diff --git a/crates/biome_css_analyze/tests/specs/a11y/useGenericFontNames/valid.css b/crates/biome_css_analyze/tests/specs/a11y/useGenericFontNames/valid.css
index 697ad9499b43..a6881a58c86e 100644
--- a/crates/biome_css_analyze/tests/specs/a11y/useGenericFontNames/valid.css
+++ b/crates/biome_css_analyze/tests/specs/a11y/useGenericFontNames/valid.css
@@ -27,4 +27,6 @@ a { font-family: Arial, var(--fallback); }
 a { font: 1em "Noto Serif", var(--serif); }
 a { font: 14px/1.5 Arial, var(--fallback); }
 a { font-family: revert }
-a { font-family: revert-layer }
\ No newline at end of file
+a { font-family: revert-layer }
+@supports (font: -apple-system-body) { }
+@supports (font-family: -apple-system) { }
\ No newline at end of file
diff --git a/crates/biome_css_analyze/tests/specs/a11y/useGenericFontNames/valid.css.snap b/crates/biome_css_analyze/tests/specs/a11y/useGenericFontNames/valid.css.snap
index 28ef235ae5ce..da0bd2f23108 100644
--- a/crates/biome_css_analyze/tests/specs/a11y/useGenericFontNames/valid.css.snap
+++ b/crates/biome_css_analyze/tests/specs/a11y/useGenericFontNames/valid.css.snap
@@ -34,4 +34,6 @@ a { font: 1em "Noto Serif", var(--serif); }
 a { font: 14px/1.5 Arial, var(--fallback); }
 a { font-family: revert }
 a { font-family: revert-layer }
+@supports (font: -apple-system-body) { }
+@supports (font-family: -apple-system) { }
 ```