头襟（日语：头襟/头巾/兜巾／ときん）是戴在日本修验道的山伏或日本神话中的天狗的额头上的一个小型黑色冠帽。

据日本史书《役行者本记》记载，役小角在701年获大赦，从流放地伊豆大岛回到大和国之际，获文武天皇下赐一顶黑色的冠，是头襟的由来。江户时代开始微型化，变成现在的形制。

此外，头襟在外观上类似于正统派的犹太人的经文匣。根据日犹同祖论的一些分析，它们二者可能是同源的。

A Tokin(頭襟, ときん) is a small black box worn on the foreheads of Yamabushi – practitioners of Shugendō – or Tengu, dangerous yet protective spirits of the mountains and forests from the Japanese mythology. It is not only worn as a head decoration, but also used as a drinking cup. It is similar in appearance to tefillin worn by Orthodox Jews. It is theorized that they may be of common origin (see reference articles in Japanese-Jewish Common Ancestor Theory); however the Tokin may simply be an evolution and miniaturization of a full-sized hat of the same name worn earlier in the Kamakura period.