diff --git a/explorer/interpreter/action_stack.cpp b/explorer/interpreter/action_stack.cpp
index de0597516ce7..c8bb6a460f2c 100644
--- a/explorer/interpreter/action_stack.cpp
+++ b/explorer/interpreter/action_stack.cpp
@@ -19,20 +19,6 @@ void ActionStack::Print(llvm::raw_ostream& out) const {
   }
 }
 
-// OBSOLETE
-void ActionStack::PrintScopes(llvm::raw_ostream& out) const {
-  llvm::ListSeparator sep(" ## ");
-  for (const std::unique_ptr<Action>& action : todo_) {
-    if (action->scope().has_value()) {
-      out << sep << *action->scope();
-    }
-  }
-  if (globals_.has_value()) {
-    out << sep << *globals_;
-  }
-  // TODO: should we print constants as well?
-}
-
 void ActionStack::Start(std::unique_ptr<Action> action) {
   result_ = std::nullopt;
   CARBON_CHECK(todo_.IsEmpty());
diff --git a/explorer/interpreter/action_stack.h b/explorer/interpreter/action_stack.h
index 4eccc95511f5..5f11d6b56180 100644
--- a/explorer/interpreter/action_stack.h
+++ b/explorer/interpreter/action_stack.h
@@ -33,9 +33,6 @@ class ActionStack {
   void Print(llvm::raw_ostream& out) const;
   LLVM_DUMP_METHOD void Dump() const { Print(llvm::errs()); }
 
-  // TODO: consider unifying with Print.
-  void PrintScopes(llvm::raw_ostream& out) const;
-
   // Starts execution with `action` at the top of the stack. Cannot be called
   // when IsEmpty() is false.
   void Start(std::unique_ptr<Action> action);