小丑鱼（英语：Clownfish或anemonefish）是对雀鲷科底下的海葵鱼亚科（Amphiprioninae）鱼类的俗称，是一种热带海水鱼。已知有28物种来自棘颊雀鲷属（Premnas），其余来自双锯鱼属（Amphiprion）。小丑鱼与海葵有着密不可分的共生关系，因此又称海葵鱼（Anemonefish）。带毒刺的海葵保护小丑鱼，海葵则吃小丑鱼消化后的残渣，形成一种互利共生的关系。小丑鱼最长可长至18公分，最小仅10公分。

Clownfish or anemonefish are fishes from the subfamily Amphiprioninae in the family Pomacentridae. Thirty species are recognized: one in the genus Premnas, while the remaining are in the genus Amphiprion. In the wild, they all form symbiotic mutualisms with sea anemones. Depending on species, anemonefish are overall yellow, orange, or a reddish or blackish color, and many show white bars or patches. The largest can reach a length of 18 centimetres (7.1 in), while the smallest barely achieve 10 centimetres (3.9 in).