锁镰（くさりがま，中译尚有「锁镰」、「锁链」、「索连棍」）是在日本战国时期出现的一种改自农用镰刀的武器，被忍者广泛使用。其一端带有一把镰刀，另一端有长长的铁链和一个重锤，甩出的重锤就算落空了，也有机会使铁链缠卷敌人的肢体或武器，亦可以使用镰刀砍杀。 但是这种武器似乎难以控制，许多忍者仍然喜欢用刀剑，战国结束后锁镰逐渐没落。

The kusarigama(鎖鎌, lit. "chain-sickle") is a traditional Japanese weapon that consists of a kama (the Japanese equivalent of a sickle) on a kusari-fundo – a type of metal chain (kusari) with a heavy iron weight (fundo) at the end. The kusarigama is said to have developed during the Muromachi period. The art of handling the kusarigama is called kusarigamajutsu.