diff --git a/Lib/mimetypes.py b/Lib/mimetypes.py
index 4750408173ec07..56eb8d7d5de602 100644
--- a/Lib/mimetypes.py
+++ b/Lib/mimetypes.py
@@ -519,6 +519,7 @@ def _default_mime_types():
         '.aiff'   : 'audio/x-aiff',
         '.ra'     : 'audio/x-pn-realaudio',
         '.wav'    : 'audio/x-wav',
+        '.avif'   : 'image/avif',
         '.bmp'    : 'image/bmp',
         '.gif'    : 'image/gif',
         '.ief'    : 'image/ief',
diff --git a/Misc/NEWS.d/next/Library/2022-01-23-16-30-49.bpo-46456.LRAQ1h.rst b/Misc/NEWS.d/next/Library/2022-01-23-16-30-49.bpo-46456.LRAQ1h.rst
new file mode 100644
index 00000000000000..861f5099ec074d
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2022-01-23-16-30-49.bpo-46456.LRAQ1h.rst
@@ -0,0 +1 @@
+Add '.avif' mime to 'image/avif'.