diff --git a/changelog_unreleased/css/10773.md b/changelog_unreleased/css/10773.md
new file mode 100644
index 000000000..f08ed1ed7
--- /dev/null
+++ b/changelog_unreleased/css/10773.md
@@ -0,0 +1,34 @@
+#### Exclude `@keyframes` params from being parsed as a Less variable (#10773 by @tmazeika)
+
+<!-- prettier-ignore -->
+```css
+/* Input */
+@keyframes :global(spin) {
+  from {
+    transform: rotate(0deg);
+  }
+  to {
+    transform: rotate(360deg);
+  }
+}
+
+/* Prettier stable */
+@keyframes: global(spin){
+  from {
+    transform: rotate(0deg);
+  }
+  to {
+    transform: rotate(360deg);
+  }
+};
+
+/* Prettier main */
+@keyframes :global(spin) {
+  from {
+    transform: rotate(0deg);
+  }
+  to {
+    transform: rotate(360deg);
+  }
+}
+```
diff --git a/cspell.json b/cspell.json
index 19e23479c..24f6c425a 100644
--- a/cspell.json
+++ b/cspell.json
@@ -198,6 +198,7 @@
         "kddeisz",
         "kddnewton",
         "Kearney",
+        "keyframes",
         "keyof",
         "Khatri",
         "l’objectif",
diff --git a/src/language-css/parser-postcss.js b/src/language-css/parser-postcss.js
index 5c7ea089e..79ce19830 100644
--- a/src/language-css/parser-postcss.js
+++ b/src/language-css/parser-postcss.js
@@ -477,7 +477,7 @@ function parseNestedCSS(node, options) {
 
         // `@color :blue;`
         if (
-          !["page", "nest"].includes(node.name) &&
+          !["page", "nest", "keyframes"].includes(node.name) &&
           node.params &&
           node.params[0] === ":"
         ) {
diff --git a/tests/format/css/modules/__snapshots__/jsfmt.spec.js.snap b/tests/format/css/modules/__snapshots__/jsfmt.spec.js.snap
index a18f2d0b8..23e80f400 100644
--- a/tests/format/css/modules/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/format/css/modules/__snapshots__/jsfmt.spec.js.snap
@@ -53,6 +53,15 @@ printWidth: 80
   exportedKey: exportedValue;
 }
 
+@keyframes :global(spin) {
+  from {
+    transform: rotate(0deg);
+  }
+  to {
+    transform: rotate(360deg);
+  }
+}
+
 =====================================output=====================================
 @value colors: './colors.css';
 @value first, second, third from colors;
@@ -101,5 +110,14 @@ printWidth: 80
   exportedKey: exportedValue;
 }
 
+@keyframes :global(spin) {
+  from {
+    transform: rotate(0deg);
+  }
+  to {
+    transform: rotate(360deg);
+  }
+}
+
 ================================================================================
 `;
diff --git a/tests/format/css/modules/modules.css b/tests/format/css/modules/modules.css
index bd8574305..c721d6975 100644
--- a/tests/format/css/modules/modules.css
+++ b/tests/format/css/modules/modules.css
@@ -44,3 +44,12 @@
 :export {
   exportedKey: exportedValue;
 }
+
+@keyframes :global(spin) {
+  from {
+    transform: rotate(0deg);
+  }
+  to {
+    transform: rotate(360deg);
+  }
+}