鱼肝油（也称“肝油”）是一种从鳕鱼等海洋鱼类肝脏中提取的油，通常为黄色到橙红色的透明油状液体，带有鱼腥味。

1848年挪威开始用水蒸汽加热法制造鱼肝油。1880年日本采用水煮法制造鱼肝油。鱼肝油通常被加工为胶囊剂型，作为营养品或者药品用来补充人体所需的维生素A和维生素D，但吃过多可能会发生维生素中毒的现象。

Cod liver oil is a nutritional supplement derived from liver of cod fish (Gadidae). As with most fish oils, it has high levels of the omega-3 fatty acids, eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). Cod liver oil also contains vitamin A and vitamin D. It has historically been taken because of its vitamin A and vitamin D content. It was once commonly given to children, because vitamin D has been shown to prevent rickets and other symptoms of vitamin D deficiency.