diff --git a/Misc/NEWS.d/next/Library/2024-11-27-23-13-21.gh-issue-127335.IiqYeX.rst b/Misc/NEWS.d/next/Library/2024-11-27-23-13-21.gh-issue-127335.IiqYeX.rst
new file mode 100644
index 00000000000000..0e8ddfe0cd2ecb
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2024-11-27-23-13-21.gh-issue-127335.IiqYeX.rst
@@ -0,0 +1,2 @@
+Add the ``TIOCM_OUT1``, ``TIOCM_OUT2``, and ``TIOCM_LOOP`` constants to the
+:mod:`termios` module.
diff --git a/Modules/termios.c b/Modules/termios.c
index efb5fcc17fa5ef..23d5d54765627c 100644
--- a/Modules/termios.c
+++ b/Modules/termios.c
@@ -1232,6 +1232,15 @@ static struct constant {
 #ifdef TIOCM_ST
     {"TIOCM_ST", TIOCM_ST},
 #endif
+#ifdef TIOCM_OUT1
+    {"TIOCM_OUT1", TIOCM_OUT1},
+#endif
+#ifdef TIOCM_OUT2
+    {"TIOCM_OUT2", TIOCM_OUT2},
+#endif
+#ifdef TIOCM_LOOP
+    {"TIOCM_LOOP", TIOCM_LOOP},
+#endif
 #ifdef TIOCNOTTY
     {"TIOCNOTTY", TIOCNOTTY},
 #endif