狼鳍鱼（学名：Lycoptera）是狼鳍鱼科的一种已经灭绝的原始真骨鱼类。约生活于晚侏罗纪-早白垩纪时期。

狼鳍鱼体长在10厘米左右，身体呈纺锤形或长纺锤形，背鳍位置靠后，于臀鳍相对，其前有上神经棘，头部膜质骨具有薄间光质层，尾正型，圆鳞，牙齿呈尖锥形。

Lycoptera is a genus of fish that lived from the late Jurassic to Cretaceous periods in present-day China, Korea, Mongolia and Siberia. It is known from abundant fossils representing sixteen species, which serve as important index fossil used to date geologic formations in China. Along with the genus Peipiaosteus, Lycoptera has been considered a defining member of the Jehol Biota, a prehistoric ecosystem famous for its early birds and feathered dinosaurs, which flourished for 20 million years during the Early Cretaceous.