diff --git a/Lib/mimetypes.py b/Lib/mimetypes.py
index e14d0719bed..4750408173e 100644
--- a/Lib/mimetypes.py
+++ b/Lib/mimetypes.py
@@ -436,6 +436,8 @@ def _default_mime_types():
         '.doc'    : 'application/msword',
         '.dot'    : 'application/msword',
         '.wiz'    : 'application/msword',
+        '.nq'     : 'application/n-quads',
+        '.nt'     : 'application/n-triples',
         '.bin'    : 'application/octet-stream',
         '.a'      : 'application/octet-stream',
         '.dll'    : 'application/octet-stream',
@@ -449,6 +451,7 @@ def _default_mime_types():
         '.ps'     : 'application/postscript',
         '.ai'     : 'application/postscript',
         '.eps'    : 'application/postscript',
+        '.trig'   : 'application/trig',
         '.m3u'    : 'application/vnd.apple.mpegurl',
         '.m3u8'   : 'application/vnd.apple.mpegurl',
         '.xls'    : 'application/vnd.ms-excel',
@@ -546,6 +549,7 @@ def _default_mime_types():
         '.csv'    : 'text/csv',
         '.html'   : 'text/html',
         '.htm'    : 'text/html',
+        '.n3'     : 'text/n3',
         '.txt'    : 'text/plain',
         '.bat'    : 'text/plain',
         '.c'      : 'text/plain',
diff --git a/Misc/NEWS.d/next/Library/2020-11-10-17-46-12.bpo-42158.OhxAiH.rst b/Misc/NEWS.d/next/Library/2020-11-10-17-46-12.bpo-42158.OhxAiH.rst
new file mode 100644
index 00000000000..a71b481219e
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2020-11-10-17-46-12.bpo-42158.OhxAiH.rst
@@ -0,0 +1 @@
+Add MIME types for N-quads, N-triples, Notation3 and TriG to ``mimetypes``.