刀 (disambiguation)

刀 is the Kangxi radical 18.

刀 may also refer to:
 * Dao (sword), a category of single-edge Chinese swords primarily used for slashing and chopping
 * Japanese sword
 * Katana, a type of single-edged Japanese sword, used by the samurai
 * The Blade, a 1995 Hong Kong film
 * A slang term for the United States dollar