diff --git a/java/ql/lib/change-notes/2023-07-11-file-classes.md b/java/ql/lib/change-notes/2023-07-11-file-classes.md
new file mode 100644
index 00000000000..b19fe60022b
--- /dev/null
+++ b/java/ql/lib/change-notes/2023-07-11-file-classes.md
@@ -0,0 +1,4 @@
+---
+category: feature
+---
+* A `Class.isFileClass()` predicate, to identify Kotlin file classes, has been added.
diff --git a/java/ql/lib/semmle/code/java/Type.qll b/java/ql/lib/semmle/code/java/Type.qll
index e8e9c2bf916..59338ed198e 100644
--- a/java/ql/lib/semmle/code/java/Type.qll
+++ b/java/ql/lib/semmle/code/java/Type.qll
@@ -709,6 +709,12 @@ class Class extends ClassOrInterface {
     )
   }
 
+  /**
+   * Holds if this class is Kotlin "file class", e.g. the class FooKt
+   * for top-level entities in Foo.kt.
+   */
+  predicate isFileClass() { file_class(this) }
+
   override string getAPrimaryQlClass() { result = "Class" }
 }