鲣鱼干（日语：鲣节（かつおぶし） ）又称木鱼、柴鱼、干鲣鱼，是将鲣腹部后方的肌肉加工制造而成的鱼干。其刨成一片一片的食品称鲣鱼干片（木鱼花、柴鱼片）。

鲣鱼干的形状颜色像木柴，因此才会被称为木鱼或柴鱼。

Katsuobushi(鰹節 or かつおぶし) or okaka(おかか) is the Japanese name for dried, fermented, and smoked skipjack tuna (Katsuwonus pelamis). Sometimes known as Bonito flakes, young bonito is sometimes used as a cheaper substitute for skipjack tuna, particularly in canned products, and has a similar color and texture, but not all countries allow marketing of bonito as skipjack tuna.