diff --git a/Doc/library/stdtypes.rst b/Doc/library/stdtypes.rst
index 69152788616d11..2099ef56169ede 100644
--- a/Doc/library/stdtypes.rst
+++ b/Doc/library/stdtypes.rst
@@ -3735,12 +3735,13 @@ arbitrary binary data.
    The separator to search for may be any :term:`bytes-like object`.
 
 
-.. method:: bytes.replace(old, new, count=-1, /)
-            bytearray.replace(old, new, count=-1, /)
+.. method:: bytes.replace(old, new, /, count=-1)
+            bytearray.replace(old, new, /, count=-1)
 
    Return a copy of the sequence with all occurrences of subsequence *old*
-   replaced by *new*.  If the optional argument *count* is given, only the
-   first *count* occurrences are replaced.
+   replaced by *new*.  If *count* is given, only the first *count* occurrences
+   are replaced.  If *count* is not specified or ``-1``, then all occurrences
+   are replaced.
 
    The subsequence to search for and its replacement may be any
    :term:`bytes-like object`.
@@ -3750,6 +3751,9 @@ arbitrary binary data.
       The bytearray version of this method does *not* operate in place - it
       always produces a new object, even if no changes were made.
 
+   .. versionchanged:: next
+      *count* is now supported as a keyword argument.
+
 
 .. method:: bytes.rfind(sub[, start[, end]])
             bytearray.rfind(sub[, start[, end]])
diff --git a/Doc/whatsnew/3.15.rst b/Doc/whatsnew/3.15.rst
index 462482c80122ea..99d5f4e79e1d75 100644
--- a/Doc/whatsnew/3.15.rst
+++ b/Doc/whatsnew/3.15.rst
@@ -604,6 +604,9 @@ Other language changes
   respectively.
   (Contributed by Sergey B Kirpichev in :gh:`146151`.)
 
+* Allow the *count* argument of :meth:`bytes.replace` to be a keyword.
+  (Contributed by Stan Ulbrych in :gh:`147856`.)
+
 
 New modules
 ===========
diff --git a/Lib/test/test_bytes.py b/Lib/test/test_bytes.py
index df22d5cd96ee0c..120b611ba9cf4a 100644
--- a/Lib/test/test_bytes.py
+++ b/Lib/test/test_bytes.py
@@ -878,6 +878,13 @@ def test_replace(self):
         self.assertEqual(b.replace(b'i', b'a'), b'massassappa')
         self.assertEqual(b.replace(b'ss', b'x'), b'mixixippi')
 
+    def test_replace_count_keyword(self):
+        b = self.type2test(b'aa')
+        self.assertEqual(b.replace(b'a', b'b', count=0), b'aa')
+        self.assertEqual(b.replace(b'a', b'b', count=1), b'ba')
+        self.assertEqual(b.replace(b'a', b'b', count=2), b'bb')
+        self.assertEqual(b.replace(b'a', b'b', count=3), b'bb')
+
     def test_replace_int_error(self):
         self.assertRaises(TypeError, self.type2test(b'a b').replace, 32, b'')
 
diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2026-03-31-18-07-53.gh-issue-147856.62Dwee.rst b/Misc/NEWS.d/next/Core_and_Builtins/2026-03-31-18-07-53.gh-issue-147856.62Dwee.rst
new file mode 100644
index 00000000000000..67ebd57b3a50f6
--- /dev/null
+++ b/Misc/NEWS.d/next/Core_and_Builtins/2026-03-31-18-07-53.gh-issue-147856.62Dwee.rst
@@ -0,0 +1 @@
+Allow the *count* argument of :meth:`bytes.replace` to be a keyword.
diff --git a/Objects/bytearrayobject.c b/Objects/bytearrayobject.c
index e2fea94e099626..552f7144c0d44b 100644
--- a/Objects/bytearrayobject.c
+++ b/Objects/bytearrayobject.c
@@ -1752,27 +1752,26 @@ bytearray_maketrans_impl(Py_buffer *frm, Py_buffer *to)
 
 
 /*[clinic input]
-@permit_long_docstring_body
 @critical_section
 bytearray.replace
 
     old: Py_buffer
     new: Py_buffer
+    /
     count: Py_ssize_t = -1
         Maximum number of occurrences to replace.
         -1 (the default value) means replace all occurrences.
-    /
 
 Return a copy with all occurrences of substring old replaced by new.
 
-If the optional argument count is given, only the first count occurrences are
-replaced.
+If count is given, only the first count occurrences are replaced.
+If count is not specified or -1, then all occurrences are replaced.
 [clinic start generated code]*/
 
 static PyObject *
 bytearray_replace_impl(PyByteArrayObject *self, Py_buffer *old,
                        Py_buffer *new, Py_ssize_t count)
-/*[clinic end generated code: output=d39884c4dc59412a input=66afec32f4e095e0]*/
+/*[clinic end generated code: output=d39884c4dc59412a input=e2591806f954aec3]*/
 {
     return stringlib_replace((PyObject *)self,
                              (const char *)old->buf, old->len,
diff --git a/Objects/bytesobject.c b/Objects/bytesobject.c
index 00c1c63b8e01c6..b84ce2b53efdf6 100644
--- a/Objects/bytesobject.c
+++ b/Objects/bytesobject.c
@@ -2403,26 +2403,25 @@ bytes_maketrans_impl(Py_buffer *frm, Py_buffer *to)
 
 
 /*[clinic input]
-@permit_long_docstring_body
 bytes.replace
 
     old: Py_buffer
     new: Py_buffer
+    /
     count: Py_ssize_t = -1
         Maximum number of occurrences to replace.
         -1 (the default value) means replace all occurrences.
-    /
 
 Return a copy with all occurrences of substring old replaced by new.
 
-If the optional argument count is given, only the first count occurrences are
-replaced.
+If count is given, only the first count occurrences are replaced.
+If count is not specified or -1, then all occurrences are replaced.
 [clinic start generated code]*/
 
 static PyObject *
 bytes_replace_impl(PyBytesObject *self, Py_buffer *old, Py_buffer *new,
                    Py_ssize_t count)
-/*[clinic end generated code: output=994fa588b6b9c104 input=8b99a9ab32bc06a2]*/
+/*[clinic end generated code: output=994fa588b6b9c104 input=cdf3cf8639297745]*/
 {
     return stringlib_replace((PyObject *)self,
                              (const char *)old->buf, old->len,
diff --git a/Objects/clinic/bytearrayobject.c.h b/Objects/clinic/bytearrayobject.c.h
index cf60d0ceadc7d1..d173f45d7beb1e 100644
--- a/Objects/clinic/bytearrayobject.c.h
+++ b/Objects/clinic/bytearrayobject.c.h
@@ -793,7 +793,7 @@ bytearray_maketrans(PyObject *null, PyObject *const *args, Py_ssize_t nargs)
 }
 
 PyDoc_STRVAR(bytearray_replace__doc__,
-"replace($self, old, new, count=-1, /)\n"
+"replace($self, old, new, /, count=-1)\n"
 "--\n"
 "\n"
 "Return a copy with all occurrences of substring old replaced by new.\n"
@@ -802,25 +802,56 @@ PyDoc_STRVAR(bytearray_replace__doc__,
 "    Maximum number of occurrences to replace.\n"
 "    -1 (the default value) means replace all occurrences.\n"
 "\n"
-"If the optional argument count is given, only the first count occurrences are\n"
-"replaced.");
+"If count is given, only the first count occurrences are replaced.\n"
+"If count is not specified or -1, then all occurrences are replaced.");
 
 #define BYTEARRAY_REPLACE_METHODDEF    \
-    {"replace", _PyCFunction_CAST(bytearray_replace), METH_FASTCALL, bytearray_replace__doc__},
+    {"replace", _PyCFunction_CAST(bytearray_replace), METH_FASTCALL|METH_KEYWORDS, bytearray_replace__doc__},
 
 static PyObject *
 bytearray_replace_impl(PyByteArrayObject *self, Py_buffer *old,
                        Py_buffer *new, Py_ssize_t count);
 
 static PyObject *
-bytearray_replace(PyObject *self, PyObject *const *args, Py_ssize_t nargs)
+bytearray_replace(PyObject *self, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
+    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
+
+    #define NUM_KEYWORDS 1
+    static struct {
+        PyGC_Head _this_is_not_used;
+        PyObject_VAR_HEAD
+        Py_hash_t ob_hash;
+        PyObject *ob_item[NUM_KEYWORDS];
+    } _kwtuple = {
+        .ob_base = PyVarObject_HEAD_INIT(&PyTuple_Type, NUM_KEYWORDS)
+        .ob_hash = -1,
+        .ob_item = { &_Py_ID(count), },
+    };
+    #undef NUM_KEYWORDS
+    #define KWTUPLE (&_kwtuple.ob_base.ob_base)
+
+    #else  // !Py_BUILD_CORE
+    #  define KWTUPLE NULL
+    #endif  // !Py_BUILD_CORE
+
+    static const char * const _keywords[] = {"", "", "count", NULL};
+    static _PyArg_Parser _parser = {
+        .keywords = _keywords,
+        .fname = "replace",
+        .kwtuple = KWTUPLE,
+    };
+    #undef KWTUPLE
+    PyObject *argsbuf[3];
+    Py_ssize_t noptargs = nargs + (kwnames ? PyTuple_GET_SIZE(kwnames) : 0) - 2;
     Py_buffer old = {NULL, NULL};
     Py_buffer new = {NULL, NULL};
     Py_ssize_t count = -1;
 
-    if (!_PyArg_CheckPositional("replace", nargs, 2, 3)) {
+    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
+            /*minpos*/ 2, /*maxpos*/ 3, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
+    if (!args) {
         goto exit;
     }
     if (PyObject_GetBuffer(args[0], &old, PyBUF_SIMPLE) != 0) {
@@ -829,8 +860,8 @@ bytearray_replace(PyObject *self, PyObject *const *args, Py_ssize_t nargs)
     if (PyObject_GetBuffer(args[1], &new, PyBUF_SIMPLE) != 0) {
         goto exit;
     }
-    if (nargs < 3) {
-        goto skip_optional;
+    if (!noptargs) {
+        goto skip_optional_pos;
     }
     {
         Py_ssize_t ival = -1;
@@ -844,7 +875,7 @@ bytearray_replace(PyObject *self, PyObject *const *args, Py_ssize_t nargs)
         }
         count = ival;
     }
-skip_optional:
+skip_optional_pos:
     Py_BEGIN_CRITICAL_SECTION(self);
     return_value = bytearray_replace_impl((PyByteArrayObject *)self, &old, &new, count);
     Py_END_CRITICAL_SECTION();
@@ -1835,4 +1866,4 @@ bytearray_sizeof(PyObject *self, PyObject *Py_UNUSED(ignored))
 {
     return bytearray_sizeof_impl((PyByteArrayObject *)self);
 }
-/*[clinic end generated code: output=2d76ef023928424f input=a9049054013a1b77]*/
+/*[clinic end generated code: output=d4976faf6731b8da input=a9049054013a1b77]*/
diff --git a/Objects/clinic/bytesobject.c.h b/Objects/clinic/bytesobject.c.h
index 00cf13d422d900..99fcd48898c0bc 100644
--- a/Objects/clinic/bytesobject.c.h
+++ b/Objects/clinic/bytesobject.c.h
@@ -789,7 +789,7 @@ bytes_maketrans(PyObject *null, PyObject *const *args, Py_ssize_t nargs)
 }
 
 PyDoc_STRVAR(bytes_replace__doc__,
-"replace($self, old, new, count=-1, /)\n"
+"replace($self, old, new, /, count=-1)\n"
 "--\n"
 "\n"
 "Return a copy with all occurrences of substring old replaced by new.\n"
@@ -798,25 +798,56 @@ PyDoc_STRVAR(bytes_replace__doc__,
 "    Maximum number of occurrences to replace.\n"
 "    -1 (the default value) means replace all occurrences.\n"
 "\n"
-"If the optional argument count is given, only the first count occurrences are\n"
-"replaced.");
+"If count is given, only the first count occurrences are replaced.\n"
+"If count is not specified or -1, then all occurrences are replaced.");
 
 #define BYTES_REPLACE_METHODDEF    \
-    {"replace", _PyCFunction_CAST(bytes_replace), METH_FASTCALL, bytes_replace__doc__},
+    {"replace", _PyCFunction_CAST(bytes_replace), METH_FASTCALL|METH_KEYWORDS, bytes_replace__doc__},
 
 static PyObject *
 bytes_replace_impl(PyBytesObject *self, Py_buffer *old, Py_buffer *new,
                    Py_ssize_t count);
 
 static PyObject *
-bytes_replace(PyObject *self, PyObject *const *args, Py_ssize_t nargs)
+bytes_replace(PyObject *self, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
+    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
+
+    #define NUM_KEYWORDS 1
+    static struct {
+        PyGC_Head _this_is_not_used;
+        PyObject_VAR_HEAD
+        Py_hash_t ob_hash;
+        PyObject *ob_item[NUM_KEYWORDS];
+    } _kwtuple = {
+        .ob_base = PyVarObject_HEAD_INIT(&PyTuple_Type, NUM_KEYWORDS)
+        .ob_hash = -1,
+        .ob_item = { &_Py_ID(count), },
+    };
+    #undef NUM_KEYWORDS
+    #define KWTUPLE (&_kwtuple.ob_base.ob_base)
+
+    #else  // !Py_BUILD_CORE
+    #  define KWTUPLE NULL
+    #endif  // !Py_BUILD_CORE
+
+    static const char * const _keywords[] = {"", "", "count", NULL};
+    static _PyArg_Parser _parser = {
+        .keywords = _keywords,
+        .fname = "replace",
+        .kwtuple = KWTUPLE,
+    };
+    #undef KWTUPLE
+    PyObject *argsbuf[3];
+    Py_ssize_t noptargs = nargs + (kwnames ? PyTuple_GET_SIZE(kwnames) : 0) - 2;
     Py_buffer old = {NULL, NULL};
     Py_buffer new = {NULL, NULL};
     Py_ssize_t count = -1;
 
-    if (!_PyArg_CheckPositional("replace", nargs, 2, 3)) {
+    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
+            /*minpos*/ 2, /*maxpos*/ 3, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
+    if (!args) {
         goto exit;
     }
     if (PyObject_GetBuffer(args[0], &old, PyBUF_SIMPLE) != 0) {
@@ -825,8 +856,8 @@ bytes_replace(PyObject *self, PyObject *const *args, Py_ssize_t nargs)
     if (PyObject_GetBuffer(args[1], &new, PyBUF_SIMPLE) != 0) {
         goto exit;
     }
-    if (nargs < 3) {
-        goto skip_optional;
+    if (!noptargs) {
+        goto skip_optional_pos;
     }
     {
         Py_ssize_t ival = -1;
@@ -840,7 +871,7 @@ bytes_replace(PyObject *self, PyObject *const *args, Py_ssize_t nargs)
         }
         count = ival;
     }
-skip_optional:
+skip_optional_pos:
     return_value = bytes_replace_impl((PyBytesObject *)self, &old, &new, count);
 
 exit:
@@ -1411,4 +1442,4 @@ bytes_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=08b9507244f73638 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=5675f7008a84ce6d input=a9049054013a1b77]*/
diff --git a/Objects/clinic/unicodeobject.c.h b/Objects/clinic/unicodeobject.c.h
index 1819fbaea220a3..4b53e24fb7d649 100644
--- a/Objects/clinic/unicodeobject.c.h
+++ b/Objects/clinic/unicodeobject.c.h
@@ -918,8 +918,8 @@ PyDoc_STRVAR(unicode_replace__doc__,
 "    Maximum number of occurrences to replace.\n"
 "    -1 (the default value) means replace all occurrences.\n"
 "\n"
-"If the optional argument count is given, only the first count occurrences are\n"
-"replaced.");
+"If count is given, only the first count occurrences are replaced.\n"
+"If count is not specified or -1, then all occurrences are replaced.");
 
 #define UNICODE_REPLACE_METHODDEF    \
     {"replace", _PyCFunction_CAST(unicode_replace), METH_FASTCALL|METH_KEYWORDS, unicode_replace__doc__},
@@ -1908,4 +1908,4 @@ unicode_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=238917fe66120bde input=a9049054013a1b77]*/
+/*[clinic end generated code: output=13eaf65699ea9fc9 input=a9049054013a1b77]*/
diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index daf4651c4313b3..24aa957cf563e9 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -12561,7 +12561,6 @@ PyUnicode_Replace(PyObject *str,
 }
 
 /*[clinic input]
-@permit_long_docstring_body
 str.replace as unicode_replace
 
     old: unicode
@@ -12573,14 +12572,14 @@ str.replace as unicode_replace
 
 Return a copy with all occurrences of substring old replaced by new.
 
-If the optional argument count is given, only the first count occurrences are
-replaced.
+If count is given, only the first count occurrences are replaced.
+If count is not specified or -1, then all occurrences are replaced.
 [clinic start generated code]*/
 
 static PyObject *
 unicode_replace_impl(PyObject *self, PyObject *old, PyObject *new,
                      Py_ssize_t count)
-/*[clinic end generated code: output=b63f1a8b5eebf448 input=f27ca92ac46b65a1]*/
+/*[clinic end generated code: output=b63f1a8b5eebf448 input=d15a6886b05e2edc]*/
 {
     return replace(self, old, new, count);
 }