The ōdachi (大太刀) (large/great sword) or nodachi (野太刀, field sword) is a type of traditionally made Japanese sword (日本刀, nihontō) used by the samurai class of feudal Japan. The Chinese equivalent of this type of sword in terms of weight and length is the miaodao or the earlier zhanmadao, and the Western battlefield equivalent (though less similar) is the Zweihänder.

To qualify as an ōdachi, the sword in question would have a blade length of around 3 shaku (90.9 cm (35.8 in)). However, as with most terms in Japanese sword arts, there is no exact definition of the size of an ōdachi.

Enjoys fencing and historical battle reenactments.