diff --git a/Misc/NEWS.d/next/Library/2026-06-23-15-02-27.gh-issue-152017.wH89hr.rst b/Misc/NEWS.d/next/Library/2026-06-23-15-02-27.gh-issue-152017.wH89hr.rst
new file mode 100644
index 000000000000000..b903e39d6215054
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2026-06-23-15-02-27.gh-issue-152017.wH89hr.rst
@@ -0,0 +1 @@
+:class:`collections.deque` no longer suppresses :exc:`MemoryError` in certain cases.
diff --git a/Modules/_collectionsmodule.c b/Modules/_collectionsmodule.c
index 0626cc6a70bc8f7..a471501ae18d7d2 100644
--- a/Modules/_collectionsmodule.c
+++ b/Modules/_collectionsmodule.c
@@ -175,17 +175,11 @@ struct dequeobject {
 
 static inline block *
 newblock(dequeobject *deque) {
-    block *b;
     if (deque->numfreeblocks) {
         deque->numfreeblocks--;
         return deque->freeblocks[deque->numfreeblocks];
     }
-    b = PyMem_Malloc(sizeof(block));
-    if (b != NULL) {
-        return b;
-    }
-    PyErr_NoMemory();
-    return NULL;
+    return PyMem_Malloc(sizeof(block));
 }
 
 static inline void
@@ -212,6 +206,7 @@ deque_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 
     b = newblock(deque);
     if (b == NULL) {
+        PyErr_NoMemory();
         Py_DECREF(deque);
         return NULL;
     }
@@ -343,6 +338,7 @@ deque_append_lock_held(dequeobject *deque, PyObject *item, Py_ssize_t maxlen)
     if (deque->rightindex == BLOCKLEN - 1) {
         block *b = newblock(deque);
         if (b == NULL) {
+            PyErr_NoMemory();
             Py_DECREF(item);
             return -1;
         }
@@ -392,6 +388,7 @@ deque_appendleft_lock_held(dequeobject *deque, PyObject *item,
     if (deque->leftindex == 0) {
         block *b = newblock(deque);
         if (b == NULL) {
+            PyErr_NoMemory();
             Py_DECREF(item);
             return -1;
         }
@@ -746,7 +743,6 @@ deque_clear(PyObject *self)
 
     b = newblock(deque);
     if (b == NULL) {
-        PyErr_Clear();
         goto alternate_method;
     }
 
@@ -857,6 +853,7 @@ deque_inplace_repeat_impl(dequeobject *deque, Py_ssize_t n)
             if (deque->rightindex == BLOCKLEN - 1) {
                 block *b = newblock(deque);
                 if (b == NULL) {
+                    PyErr_NoMemory();
                     Py_SET_SIZE(deque, Py_SIZE(deque) + i);
                     return NULL;
                 }
@@ -977,8 +974,10 @@ _deque_rotate(dequeobject *deque, Py_ssize_t n)
         if (leftindex == 0) {
             if (b == NULL) {
                 b = newblock(deque);
-                if (b == NULL)
+                if (b == NULL) {
+                    PyErr_NoMemory();
                     goto done;
+                }
             }
             b->rightlink = leftblock;
             CHECK_END(leftblock->leftlink);
@@ -1021,8 +1020,10 @@ _deque_rotate(dequeobject *deque, Py_ssize_t n)
         if (rightindex == BLOCKLEN - 1) {
             if (b == NULL) {
                 b = newblock(deque);
-                if (b == NULL)
+                if (b == NULL) {
+                    PyErr_NoMemory();
                     goto done;
+                }
             }
             b->leftlink = rightblock;
             CHECK_END(rightblock->rightlink);