The Dull Sword (Japanese: なまくら刀, Hepburn: Namakura Gatana) is a Japanese animated short film produced by Jun'ichi Kōuchi in 1917. It was rediscovered by an antique shop employee in Osaka in March 2008.

This film is a 4-minute silent short that tells a story about a foolish rōnin's purchase of a dull-edged sword and subsequent attempts at tsujigiri. It was released on June 30, 1917, and is among the very earliest examples of anime.