腓骨(英语:fibula)是人和脊椎动物(四足类)小腿上的两块长骨之一,位于小腿外侧,较细;某些动物(如蛙和蟾蜍等)腓骨与其内侧的胫骨融合成胫腓骨(tibiofibula)。腓骨比胫骨细,作为肌肉韧带附着点,辅助承重;胫骨较粗壮,才是主要的承重骨。
腓骨上端称作腓骨小头,可以从皮肤外表面触及到;上端仅与胫骨相连接,不参与膝关节的组成;腓骨体细长,附着骨间膜;腓骨下端形成的突起为外踝;腓骨下端、胫骨下端及距骨构成踝关节。
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