diff --git a/Lib/test/test_scope.py b/Lib/test/test_scope.py
index 520fbc1b66237b..2e775911c0ae68 100644
--- a/Lib/test/test_scope.py
+++ b/Lib/test/test_scope.py
@@ -835,5 +835,23 @@ def g(self, __arg):
         with self.assertRaises(TypeError):
             closure(_MultiplyNested__arg=2)
 
+    def test_builtin_deletion_err_message(self):
+        with self.assertRaisesRegex(NameError, "cannot delete builtin 'all'"):
+            del all
+
+        def f():
+            del all
+
+        with self.assertRaisesRegex(UnboundLocalError, "cannot delete builtin 'all'"):
+            f()
+
+        def g():
+            global all
+            del all
+
+        with self.assertRaisesRegex(NameError, "cannot delete builtin 'all'"):
+            g()
+
+
 if __name__ == '__main__':
     unittest.main()
diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2025-09-18-01-13-22.gh-issue-138890.x2QKfy.rst b/Misc/NEWS.d/next/Core_and_Builtins/2025-09-18-01-13-22.gh-issue-138890.x2QKfy.rst
new file mode 100644
index 00000000000000..a96ab13e5b4cb7
--- /dev/null
+++ b/Misc/NEWS.d/next/Core_and_Builtins/2025-09-18-01-13-22.gh-issue-138890.x2QKfy.rst
@@ -0,0 +1 @@
+Deleting built-in names with :keyword:`del` now gives a clearer error message.
diff --git a/Python/bytecodes.c b/Python/bytecodes.c
index 6c3609d293890f..f1abb4cb1f5707 100644
--- a/Python/bytecodes.c
+++ b/Python/bytecodes.c
@@ -1577,9 +1577,13 @@ dummy_func(
             err = PyObject_DelItem(ns, name);
             // Can't use ERROR_IF here.
             if (err != 0) {
-                _PyEval_FormatExcCheckArg(tstate, PyExc_NameError,
-                                          NAME_ERROR_MSG,
-                                          name);
+                if (PyMapping_HasKeyWithError(BUILTINS(), name) == 1) {
+                    _PyEval_FormatExcCheckArg(tstate, PyExc_NameError,
+                                              CANNOT_DELETE_BUILTIN_ERROR_MSG, name);
+                } else {
+                    _PyEval_FormatExcCheckArg(tstate, PyExc_NameError,
+                                              NAME_ERROR_MSG, name);
+                }
                 ERROR_NO_POP();
             }
         }
@@ -1720,8 +1724,13 @@ dummy_func(
                 ERROR_NO_POP();
             }
             if (err == 0) {
-                _PyEval_FormatExcCheckArg(tstate, PyExc_NameError,
-                                          NAME_ERROR_MSG, name);
+                if (PyMapping_HasKeyWithError(BUILTINS(), name) == 1) {
+                    _PyEval_FormatExcCheckArg(tstate, PyExc_NameError,
+                                              CANNOT_DELETE_BUILTIN_ERROR_MSG, name);
+                } else {
+                    _PyEval_FormatExcCheckArg(tstate, PyExc_NameError,
+                                              NAME_ERROR_MSG, name);
+                }
                 ERROR_NO_POP();
             }
         }
@@ -1888,10 +1897,15 @@ dummy_func(
         inst(DELETE_FAST, (--)) {
             _PyStackRef v = GETLOCAL(oparg);
             if (PyStackRef_IsNull(v)) {
-                _PyEval_FormatExcCheckArg(tstate, PyExc_UnboundLocalError,
-                    UNBOUNDLOCAL_ERROR_MSG,
-                    PyTuple_GetItem(_PyFrame_GetCode(frame)->co_localsplusnames, oparg)
-                );
+                PyObject *localsplusnames = _PyFrame_GetCode(frame)->co_localsplusnames;
+                PyObject *name = PyTuple_GetItem(localsplusnames, oparg);
+                if (PyMapping_HasKeyWithError(BUILTINS(), name) == 1) {
+                    _PyEval_FormatExcCheckArg(tstate, PyExc_UnboundLocalError,
+                                              CANNOT_DELETE_BUILTIN_ERROR_MSG, name);
+                } else {
+                    _PyEval_FormatExcCheckArg(tstate, PyExc_UnboundLocalError,
+                                              UNBOUNDLOCAL_ERROR_MSG, name);
+                }
                 ERROR_IF(true);
             }
             _PyStackRef tmp = GETLOCAL(oparg);
diff --git a/Python/ceval_macros.h b/Python/ceval_macros.h
index 64ca7716fdbdee..59b3b9a12eff31 100644
--- a/Python/ceval_macros.h
+++ b/Python/ceval_macros.h
@@ -303,6 +303,7 @@ GETITEM(PyObject *v, Py_ssize_t i) {
     "cannot access free variable '%s' where it is not associated with a value" \
     " in enclosing scope"
 #define NAME_ERROR_MSG "name '%.200s' is not defined"
+#define CANNOT_DELETE_BUILTIN_ERROR_MSG "cannot delete builtin '%.200s'"
 
 // If a trace function sets a new f_lineno and
 // *then* raises, we use the destination when searching
diff --git a/Python/executor_cases.c.h b/Python/executor_cases.c.h
index 1309c1317a6615..a981db32c0e250 100644
--- a/Python/executor_cases.c.h
+++ b/Python/executor_cases.c.h
@@ -2209,11 +2209,17 @@
             err = PyObject_DelItem(ns, name);
             stack_pointer = _PyFrame_GetStackPointer(frame);
             if (err != 0) {
-                _PyFrame_SetStackPointer(frame, stack_pointer);
-                _PyEval_FormatExcCheckArg(tstate, PyExc_NameError,
-                    NAME_ERROR_MSG,
-                    name);
-                stack_pointer = _PyFrame_GetStackPointer(frame);
+                if (PyMapping_HasKeyWithError(BUILTINS(), name) == 1) {
+                    _PyFrame_SetStackPointer(frame, stack_pointer);
+                    _PyEval_FormatExcCheckArg(tstate, PyExc_NameError,
+                        CANNOT_DELETE_BUILTIN_ERROR_MSG, name);
+                    stack_pointer = _PyFrame_GetStackPointer(frame);
+                } else {
+                    _PyFrame_SetStackPointer(frame, stack_pointer);
+                    _PyEval_FormatExcCheckArg(tstate, PyExc_NameError,
+                        NAME_ERROR_MSG, name);
+                    stack_pointer = _PyFrame_GetStackPointer(frame);
+                }
                 JUMP_TO_ERROR();
             }
             break;
@@ -2420,10 +2426,17 @@
                 JUMP_TO_ERROR();
             }
             if (err == 0) {
-                _PyFrame_SetStackPointer(frame, stack_pointer);
-                _PyEval_FormatExcCheckArg(tstate, PyExc_NameError,
-                    NAME_ERROR_MSG, name);
-                stack_pointer = _PyFrame_GetStackPointer(frame);
+                if (PyMapping_HasKeyWithError(BUILTINS(), name) == 1) {
+                    _PyFrame_SetStackPointer(frame, stack_pointer);
+                    _PyEval_FormatExcCheckArg(tstate, PyExc_NameError,
+                        CANNOT_DELETE_BUILTIN_ERROR_MSG, name);
+                    stack_pointer = _PyFrame_GetStackPointer(frame);
+                } else {
+                    _PyFrame_SetStackPointer(frame, stack_pointer);
+                    _PyEval_FormatExcCheckArg(tstate, PyExc_NameError,
+                        NAME_ERROR_MSG, name);
+                    stack_pointer = _PyFrame_GetStackPointer(frame);
+                }
                 JUMP_TO_ERROR();
             }
             break;
@@ -2588,12 +2601,21 @@
             oparg = CURRENT_OPARG();
             _PyStackRef v = GETLOCAL(oparg);
             if (PyStackRef_IsNull(v)) {
+                PyObject *localsplusnames = _PyFrame_GetCode(frame)->co_localsplusnames;
                 _PyFrame_SetStackPointer(frame, stack_pointer);
-                _PyEval_FormatExcCheckArg(tstate, PyExc_UnboundLocalError,
-                    UNBOUNDLOCAL_ERROR_MSG,
-                    PyTuple_GetItem(_PyFrame_GetCode(frame)->co_localsplusnames, oparg)
-                );
+                PyObject *name = PyTuple_GetItem(localsplusnames, oparg);
                 stack_pointer = _PyFrame_GetStackPointer(frame);
+                if (PyMapping_HasKeyWithError(BUILTINS(), name) == 1) {
+                    _PyFrame_SetStackPointer(frame, stack_pointer);
+                    _PyEval_FormatExcCheckArg(tstate, PyExc_UnboundLocalError,
+                        CANNOT_DELETE_BUILTIN_ERROR_MSG, name);
+                    stack_pointer = _PyFrame_GetStackPointer(frame);
+                } else {
+                    _PyFrame_SetStackPointer(frame, stack_pointer);
+                    _PyEval_FormatExcCheckArg(tstate, PyExc_UnboundLocalError,
+                        UNBOUNDLOCAL_ERROR_MSG, name);
+                    stack_pointer = _PyFrame_GetStackPointer(frame);
+                }
                 JUMP_TO_ERROR();
             }
             _PyStackRef tmp = GETLOCAL(oparg);
diff --git a/Python/generated_cases.c.h b/Python/generated_cases.c.h
index c1f6f5c85cdd88..34c378732ed05a 100644
--- a/Python/generated_cases.c.h
+++ b/Python/generated_cases.c.h
@@ -5192,12 +5192,21 @@
             INSTRUCTION_STATS(DELETE_FAST);
             _PyStackRef v = GETLOCAL(oparg);
             if (PyStackRef_IsNull(v)) {
+                PyObject *localsplusnames = _PyFrame_GetCode(frame)->co_localsplusnames;
                 _PyFrame_SetStackPointer(frame, stack_pointer);
-                _PyEval_FormatExcCheckArg(tstate, PyExc_UnboundLocalError,
-                    UNBOUNDLOCAL_ERROR_MSG,
-                    PyTuple_GetItem(_PyFrame_GetCode(frame)->co_localsplusnames, oparg)
-                );
+                PyObject *name = PyTuple_GetItem(localsplusnames, oparg);
                 stack_pointer = _PyFrame_GetStackPointer(frame);
+                if (PyMapping_HasKeyWithError(BUILTINS(), name) == 1) {
+                    _PyFrame_SetStackPointer(frame, stack_pointer);
+                    _PyEval_FormatExcCheckArg(tstate, PyExc_UnboundLocalError,
+                        CANNOT_DELETE_BUILTIN_ERROR_MSG, name);
+                    stack_pointer = _PyFrame_GetStackPointer(frame);
+                } else {
+                    _PyFrame_SetStackPointer(frame, stack_pointer);
+                    _PyEval_FormatExcCheckArg(tstate, PyExc_UnboundLocalError,
+                        UNBOUNDLOCAL_ERROR_MSG, name);
+                    stack_pointer = _PyFrame_GetStackPointer(frame);
+                }
                 JUMP_TO_LABEL(error);
             }
             _PyStackRef tmp = GETLOCAL(oparg);
@@ -5224,10 +5233,17 @@
                 JUMP_TO_LABEL(error);
             }
             if (err == 0) {
-                _PyFrame_SetStackPointer(frame, stack_pointer);
-                _PyEval_FormatExcCheckArg(tstate, PyExc_NameError,
-                    NAME_ERROR_MSG, name);
-                stack_pointer = _PyFrame_GetStackPointer(frame);
+                if (PyMapping_HasKeyWithError(BUILTINS(), name) == 1) {
+                    _PyFrame_SetStackPointer(frame, stack_pointer);
+                    _PyEval_FormatExcCheckArg(tstate, PyExc_NameError,
+                        CANNOT_DELETE_BUILTIN_ERROR_MSG, name);
+                    stack_pointer = _PyFrame_GetStackPointer(frame);
+                } else {
+                    _PyFrame_SetStackPointer(frame, stack_pointer);
+                    _PyEval_FormatExcCheckArg(tstate, PyExc_NameError,
+                        NAME_ERROR_MSG, name);
+                    stack_pointer = _PyFrame_GetStackPointer(frame);
+                }
                 JUMP_TO_LABEL(error);
             }
             DISPATCH();
@@ -5255,11 +5271,17 @@
             err = PyObject_DelItem(ns, name);
             stack_pointer = _PyFrame_GetStackPointer(frame);
             if (err != 0) {
-                _PyFrame_SetStackPointer(frame, stack_pointer);
-                _PyEval_FormatExcCheckArg(tstate, PyExc_NameError,
-                    NAME_ERROR_MSG,
-                    name);
-                stack_pointer = _PyFrame_GetStackPointer(frame);
+                if (PyMapping_HasKeyWithError(BUILTINS(), name) == 1) {
+                    _PyFrame_SetStackPointer(frame, stack_pointer);
+                    _PyEval_FormatExcCheckArg(tstate, PyExc_NameError,
+                        CANNOT_DELETE_BUILTIN_ERROR_MSG, name);
+                    stack_pointer = _PyFrame_GetStackPointer(frame);
+                } else {
+                    _PyFrame_SetStackPointer(frame, stack_pointer);
+                    _PyEval_FormatExcCheckArg(tstate, PyExc_NameError,
+                        NAME_ERROR_MSG, name);
+                    stack_pointer = _PyFrame_GetStackPointer(frame);
+                }
                 JUMP_TO_LABEL(error);
             }
             DISPATCH();