diff --git a/newsfragments/5964.added.md b/newsfragments/5964.added.md
new file mode 100644
index 00000000000..4ca26732cd9
--- /dev/null
+++ b/newsfragments/5964.added.md
@@ -0,0 +1,2 @@
+Add `PySequence_FAST_GET_SIZE` and `PySequence_FAST_GET_ITEM`,
+and convert `PyObject_CallOneArg` and `PyVectorcall_Function` to regular functions starting in 3.11.
diff --git a/pyo3-ffi/src/cpython/abstract_.rs b/pyo3-ffi/src/cpython/abstract_.rs
index b6358f854ff..1c3b962b7cb 100644
--- a/pyo3-ffi/src/cpython/abstract_.rs
+++ b/pyo3-ffi/src/cpython/abstract_.rs
@@ -6,10 +6,13 @@ use std::ffi::c_int;
 #[cfg(not(Py_3_11))]
 use crate::Py_buffer;
 
+#[cfg(all(not(Py_3_11), not(PyPy)))]
+use crate::{PyCallable_Check, PyType_HasFeature, Py_TPFLAGS_HAVE_VECTORCALL};
+
 #[cfg(not(PyPy))]
 use crate::{
-    vectorcallfunc, PyCallable_Check, PyThreadState, PyThreadState_GET, PyTuple_Check,
-    PyType_HasFeature, Py_TPFLAGS_HAVE_VECTORCALL,
+    vectorcallfunc, PyList_Check, PyList_GET_ITEM, PyList_GET_SIZE, PyThreadState,
+    PyThreadState_GET, PyTuple_Check, PyTuple_GET_ITEM, PyTuple_GET_SIZE,
 };
 use libc::size_t;
 
@@ -49,7 +52,7 @@ pub unsafe fn PyVectorcall_NARGS(n: size_t) -> Py_ssize_t {
     n.try_into().expect("cannot fail due to mask")
 }
 
-#[cfg(not(PyPy))]
+#[cfg(all(not(Py_3_11), not(PyPy)))]
 #[inline(always)]
 pub unsafe fn PyVectorcall_Function(callable: *mut PyObject) -> Option<vectorcallfunc> {
     assert!(!callable.is_null());
@@ -64,6 +67,11 @@ pub unsafe fn PyVectorcall_Function(callable: *mut PyObject) -> Option<vectorcal
     *ptr
 }
 
+extern_libpython! {
+    #[cfg(all(Py_3_11, not(PyPy)))]
+    pub fn PyVectorcall_Function(callable: *mut PyObject) -> Option<vectorcallfunc>;
+}
+
 #[cfg(not(PyPy))]
 #[inline(always)]
 pub unsafe fn _PyObject_VectorcallTstate(
@@ -161,7 +169,7 @@ extern_libpython! {
     pub fn _PyObject_CallNoArg(func: *mut PyObject) -> *mut PyObject;
 }
 
-#[cfg(not(PyPy))]
+#[cfg(all(not(Py_3_11), not(PyPy)))]
 #[inline(always)]
 pub unsafe fn PyObject_CallOneArg(func: *mut PyObject, arg: *mut PyObject) -> *mut PyObject {
     assert!(!arg.is_null());
@@ -172,6 +180,11 @@ pub unsafe fn PyObject_CallOneArg(func: *mut PyObject, arg: *mut PyObject) -> *m
     _PyObject_VectorcallTstate(tstate, func, args, nargsf, std::ptr::null_mut())
 }
 
+extern_libpython! {
+    #[cfg(all(Py_3_11, not(PyPy)))]
+    pub fn PyObject_CallOneArg(func: *mut PyObject, arg: *mut PyObject) -> *mut PyObject;
+}
+
 #[cfg(all(Py_3_9, not(PyPy)))]
 #[inline(always)]
 pub unsafe fn PyObject_CallMethodNoArgs(
@@ -275,6 +288,28 @@ extern_libpython! {
 
 // skipped PySequence_ITEM
 
+#[cfg(not(PyPy))]
+#[inline(always)]
+pub unsafe fn PySequence_FAST_GET_SIZE(o: *mut PyObject) -> Py_ssize_t {
+    let is_list = PyList_Check(o) != 0;
+    if is_list {
+        PyList_GET_SIZE(o)
+    } else {
+        PyTuple_GET_SIZE(o)
+    }
+}
+
+#[cfg(not(PyPy))]
+#[inline(always)]
+pub unsafe fn PySequence_FAST_GET_ITEM(o: *mut PyObject, i: Py_ssize_t) -> *mut PyObject {
+    let is_list = PyList_Check(o) != 0;
+    if is_list {
+        PyList_GET_ITEM(o, i)
+    } else {
+        PyTuple_GET_ITEM(o, i)
+    }
+}
+
 pub const PY_ITERSEARCH_COUNT: c_int = 1;
 pub const PY_ITERSEARCH_INDEX: c_int = 2;
 pub const PY_ITERSEARCH_CONTAINS: c_int = 3;