diff --git a/meson.build b/meson.build
index 042742aa07..f07a4bd0bf 100644
--- a/meson.build
+++ b/meson.build
@@ -85,8 +85,7 @@ sdl_ttf = '@0@_ttf'.format(sdl)
 sdl_image = '@0@_image'.format(sdl)
 
 if sdl_api == 3
-    add_global_arguments('-DPG_SDL3=1', language: 'c')
-    add_global_arguments('-DSDL_ENABLE_OLD_NAMES=1', language: 'c')
+    add_global_arguments('-DPG_SDL3=1', '-DSDL_ENABLE_OLD_NAMES=1', language: 'c')
 endif
 
 pg_inc_dirs = []
diff --git a/src_c/font.c b/src_c/font.c
index 5817e896f6..cae985f1cc 100644
--- a/src_c/font.c
+++ b/src_c/font.c
@@ -1174,15 +1174,19 @@ font_init(PyFontObject *self, PyObject *args, PyObject *kwds)
     if (fontsize <= 1)
         fontsize = 1;
 
-    if (rw->size(rw) <= 0) {
+    if (SDL_RWsize(rw) <= 0) {
         PyErr_Format(PyExc_ValueError,
                      "Font file object has an invalid file size: %lld",
-                     rw->size(rw));
+                     SDL_RWsize(rw));
         goto error;
     }
 
     Py_BEGIN_ALLOW_THREADS;
+#if SDL_VERSION_ATLEAST(3, 0, 0)
+    font = TTF_OpenFontIO(rw, 1, fontsize);
+#else
     font = TTF_OpenFontRW(rw, 1, fontsize);
+#endif
     Py_END_ALLOW_THREADS;
 
     Py_DECREF(obj);
diff --git a/src_c/imageext.c b/src_c/imageext.c
index 0d68d59070..d2823fcb00 100644
--- a/src_c/imageext.c
+++ b/src_c/imageext.c
@@ -117,10 +117,18 @@ image_load_ext(PyObject *self, PyObject *arg, PyObject *kwarg)
     SDL_UnlockMutex(_pg_img_mutex);
     */
 
+#if SDL_VERSION_ATLEAST(3, 0, 0)
+    surf = IMG_LoadTyped_IO(rw, 1, type);
+#else
     surf = IMG_LoadTyped_RW(rw, 1, type);
+#endif
     Py_END_ALLOW_THREADS;
-#else  /* ~WITH_THREAD */
+#else /* ~WITH_THREAD */
+#if SDL_VERSION_ATLEAST(3, 0, 0)
+    surf = IMG_LoadTyped_IO(rw, 1, type);
+#else
     surf = IMG_LoadTyped_RW(rw, 1, type);
+#endif
 #endif /* ~WITH_THREAD */
 
     if (ext) {
@@ -166,7 +174,11 @@ imageext_load_sized_svg(PyObject *self, PyObject *arg, PyObject *kwargs)
     }
 
     Py_BEGIN_ALLOW_THREADS;
+#if SDL_VERSION_ATLEAST(3, 0, 0)
+    surf = IMG_LoadSizedSVG_IO(rw, width, height);
+#else
     surf = IMG_LoadSizedSVG_RW(rw, width, height);
+#endif
     SDL_RWclose(rw);
     Py_END_ALLOW_THREADS;
     if (surf == NULL) {
@@ -231,7 +243,11 @@ image_save_ext(PyObject *self, PyObject *arg, PyObject *kwarg)
         char *ext = iext_find_extension(name);
         if (!strcasecmp(ext, "jpeg") || !strcasecmp(ext, "jpg")) {
             if (rw != NULL) {
+#if SDL_VERSION_ATLEAST(3, 0, 0)
+                result = IMG_SaveJPG_IO(surf, rw, 0, JPEG_QUALITY);
+#else
                 result = IMG_SaveJPG_RW(surf, rw, 0, JPEG_QUALITY);
+#endif
             }
             else {
                 result = IMG_SaveJPG(surf, name, JPEG_QUALITY);
@@ -240,7 +256,11 @@ image_save_ext(PyObject *self, PyObject *arg, PyObject *kwarg)
         else if (!strcasecmp(ext, "png")) {
             /*Py_BEGIN_ALLOW_THREADS; */
             if (rw != NULL) {
+#if SDL_VERSION_ATLEAST(3, 0, 0)
+                result = IMG_SavePNG_IO(surf, rw, 0);
+#else
                 result = IMG_SavePNG_RW(surf, rw, 0);
+#endif
             }
             else {
                 result = IMG_SavePNG(surf, name);
diff --git a/src_c/meson.build b/src_c/meson.build
index 9804e7cdfe..f2eb2a02d1 100644
--- a/src_c/meson.build
+++ b/src_c/meson.build
@@ -93,8 +93,6 @@ rect = py.extension_module(
     subdir: pg,
 )
 
-# TODO: support SDL3
-if sdl_api != 3
 rwobject = py.extension_module(
     'rwobject',
     'rwobject.c',
@@ -103,7 +101,6 @@ rwobject = py.extension_module(
     install: true,
     subdir: pg,
 )
-endif
 
 # TODO: support SDL3
 if sdl_api != 3
diff --git a/src_c/mixer.c b/src_c/mixer.c
index 0d3fa8f393..f342e18216 100644
--- a/src_c/mixer.c
+++ b/src_c/mixer.c
@@ -1875,7 +1875,11 @@ sound_init(PyObject *self, PyObject *arg, PyObject *kwarg)
             return -1;
         }
         Py_BEGIN_ALLOW_THREADS;
+#if SDL_VERSION_ATLEAST(3, 0, 0)
+        chunk = Mix_LoadWAV_IO(rw, 1);
+#else
         chunk = Mix_LoadWAV_RW(rw, 1);
+#endif
         Py_END_ALLOW_THREADS;
         if (chunk == NULL) {
             PyErr_SetString(pgExc_SDLError, SDL_GetError());
diff --git a/src_c/music.c b/src_c/music.c
index b6b733f90c..71bc776fb2 100644
--- a/src_c/music.c
+++ b/src_c/music.c
@@ -388,7 +388,11 @@ _load_music(PyObject *obj, char *namehint)
     }
 
     Py_BEGIN_ALLOW_THREADS;
+#if SDL_VERSION_ATLEAST(3, 0, 0)
+    new_music = Mix_LoadMUSType_IO(rw, _get_type_from_hint(type), SDL_TRUE);
+#else
     new_music = Mix_LoadMUSType_RW(rw, _get_type_from_hint(type), SDL_TRUE);
+#endif
     Py_END_ALLOW_THREADS;
 
     if (ext) {
diff --git a/src_c/rwobject.c b/src_c/rwobject.c
index a88c2495b2..172702ebb3 100644
--- a/src_c/rwobject.c
+++ b/src_c/rwobject.c
@@ -46,6 +46,18 @@ static const char pg_default_errors[] = "backslashreplace";
 
 static PyObject *os_module = NULL;
 
+#if SDL_VERSION_ATLEAST(3, 0, 0)
+static Sint64
+_pg_rw_size(void *);
+static Sint64
+_pg_rw_seek(void *, Sint64, SDL_IOWhence);
+static size_t
+_pg_rw_read(void *, void *, size_t, SDL_IOStatus *);
+static size_t
+_pg_rw_write(void *, const void *, size_t, SDL_IOStatus *);
+static bool
+_pg_rw_close(void *);
+#else
 static Sint64
 _pg_rw_size(SDL_RWops *);
 static Sint64
@@ -56,6 +68,7 @@ static size_t
 _pg_rw_write(SDL_RWops *, const void *, size_t, size_t);
 static int
 _pg_rw_close(SDL_RWops *);
+#endif
 
 /* Converter function used by PyArg_ParseTupleAndKeywords with the "O&" format.
  *
@@ -291,13 +304,31 @@ pg_EncodeFilePath(PyObject *obj, PyObject *eclass)
 static int
 pgRWops_IsFileObject(SDL_RWops *rw)
 {
+#if SDL_VERSION_ATLEAST(3, 0, 0)
+    SDL_PropertiesID props = SDL_GetIOProperties(rw);
+    if (!props) {
+        // pgRWops_IsFileObject doesn't have any error checking facility
+        // so when in doubt let's say it isn't a file object.
+        return 0;
+    }
+    return SDL_GetBooleanProperty(props, "_pygame_is_file_object", 0);
+#else
     return rw->close == _pg_rw_close;
+#endif
 }
 
+#if SDL_VERSION_ATLEAST(3, 0, 0)
+static Sint64
+_pg_rw_size(void *userdata)
+{
+    pgRWHelper *helper = (pgRWHelper *)userdata;
+#else
 static Sint64
 _pg_rw_size(SDL_RWops *context)
 {
     pgRWHelper *helper = (pgRWHelper *)context->hidden.unknown.data1;
+#endif
+
     PyObject *pos = NULL;
     PyObject *tmp = NULL;
     Sint64 size;
@@ -361,10 +392,19 @@ _pg_rw_size(SDL_RWops *context)
     return retval;
 }
 
+#if SDL_VERSION_ATLEAST(3, 0, 0)
+static size_t
+_pg_rw_write(void *userdata, const void *ptr, size_t size,
+             SDL_IOStatus *status)
+{
+    pgRWHelper *helper = (pgRWHelper *)userdata;
+    size_t num = 1;
+#else
 static size_t
 _pg_rw_write(SDL_RWops *context, const void *ptr, size_t size, size_t num)
 {
     pgRWHelper *helper = (pgRWHelper *)context->hidden.unknown.data1;
+#endif
     PyObject *result;
     size_t retval;
 
@@ -382,26 +422,42 @@ _pg_rw_write(SDL_RWops *context, const void *ptr, size_t size, size_t num)
     }
 
     Py_DECREF(result);
+#if SDL_VERSION_ATLEAST(3, 0, 0)
+    retval = size;
+#else
     retval = num;
+#endif
 
 end:
     PyGILState_Release(state);
     return retval;
 }
 
+#if SDL_VERSION_ATLEAST(3, 0, 0)
+static bool
+_pg_rw_close(void *userdata)
+{
+    pgRWHelper *helper = (pgRWHelper *)userdata;
+    bool retval = true;
+#else
 static int
 _pg_rw_close(SDL_RWops *context)
 {
     pgRWHelper *helper = (pgRWHelper *)context->hidden.unknown.data1;
-    PyObject *result;
     int retval = 0;
+#endif
+    PyObject *result;
     PyGILState_STATE state = PyGILState_Ensure();
 
     if (helper->close) {
         result = PyObject_CallNoArgs(helper->close);
         if (!result) {
             PyErr_Print();
+#if SDL_VERSION_ATLEAST(3, 0, 0)
+            retval = false;
+#else
             retval = -1;
+#endif
         }
         Py_XDECREF(result);
     }
@@ -414,7 +470,9 @@ _pg_rw_close(SDL_RWops *context)
 
     PyMem_Free(helper);
     PyGILState_Release(state);
+#if !SDL_VERSION_ATLEAST(3, 0, 0)
     SDL_FreeRW(context);
+#endif
     return retval;
 }
 
@@ -437,6 +495,37 @@ pgRWops_FromFileObject(PyObject *obj)
         return NULL;
     }
 
+#if SDL_VERSION_ATLEAST(3, 0, 0)
+    SDL_IOStreamInterface iface;
+    iface.size = _pg_rw_size;
+    iface.seek = _pg_rw_seek;
+    iface.read = _pg_rw_read;
+    iface.write = _pg_rw_write;
+    iface.close = _pg_rw_close;
+
+    // TODO: These should raise SDLError probably?
+    // rwobject.c hasn't required pygame.base before (the source of SDLError)
+    // so omitting that for now.
+
+    rw = SDL_OpenIO(&iface, helper);
+    if (rw == NULL) {
+        iface.close(helper);
+        PyMem_Free(helper);
+        return (SDL_RWops *)RAISE(PyExc_IOError, SDL_GetError());
+    }
+
+    SDL_PropertiesID props = SDL_GetIOProperties(rw);
+    if (!props) {
+        PyMem_Free(helper);
+        return (SDL_RWops *)RAISE(PyExc_IOError, SDL_GetError());
+    }
+
+    if (!SDL_SetBooleanProperty(props, "_pygame_is_file_object", 1)) {
+        PyMem_Free(helper);
+        return (SDL_RWops *)RAISE(PyExc_IOError, SDL_GetError());
+    }
+
+#else
     rw = SDL_AllocRW();
     if (rw == NULL) {
         PyMem_Free(helper);
@@ -450,14 +539,22 @@ pgRWops_FromFileObject(PyObject *obj)
     rw->read = _pg_rw_read;
     rw->write = _pg_rw_write;
     rw->close = _pg_rw_close;
+#endif
 
     return rw;
 }
 
+#if SDL_VERSION_ATLEAST(3, 0, 0)
+static Sint64
+_pg_rw_seek(void *userdata, Sint64 offset, SDL_IOWhence whence)
+{
+    pgRWHelper *helper = (pgRWHelper *)userdata;
+#else
 static Sint64
 _pg_rw_seek(SDL_RWops *context, Sint64 offset, int whence)
 {
     pgRWHelper *helper = (pgRWHelper *)context->hidden.unknown.data1;
+#endif
     PyObject *result;
     Sint64 retval;
 
@@ -498,10 +595,18 @@ _pg_rw_seek(SDL_RWops *context, Sint64 offset, int whence)
     return retval;
 }
 
+#if SDL_VERSION_ATLEAST(3, 0, 0)
+static size_t
+_pg_rw_read(void *userdata, void *ptr, size_t size, SDL_IOStatus *status)
+{
+    pgRWHelper *helper = (pgRWHelper *)userdata;
+    size_t maxnum = 1;
+#else
 static size_t
 _pg_rw_read(SDL_RWops *context, void *ptr, size_t size, size_t maxnum)
 {
     pgRWHelper *helper = (pgRWHelper *)context->hidden.unknown.data1;
+#endif
     PyObject *result;
     Py_ssize_t retval;
 
@@ -527,7 +632,9 @@ _pg_rw_read(SDL_RWops *context, void *ptr, size_t size, size_t maxnum)
     retval = PyBytes_GET_SIZE(result);
     if (retval) {
         memcpy(ptr, PyBytes_AsString(result), retval);
+#if !SDL_VERSION_ATLEAST(3, 0, 0)
         retval /= size;
+#endif
     }
 
     Py_DECREF(result);
@@ -581,7 +688,11 @@ _rwops_from_pystr(PyObject *obj, char **extptr)
                     /* If out of memory, decref oencoded to be safe, and try
                      * to close out `rw` as well. */
                     Py_DECREF(oencoded);
+#if SDL_VERSION_ATLEAST(3, 0, 0)
+                    if (!SDL_RWclose(rw)) {
+#else
                     if (SDL_RWclose(rw) < 0) {
+#endif
                         PyErr_SetString(PyExc_IOError, SDL_GetError());
                     }
                     return (SDL_RWops *)PyErr_NoMemory();