日本扁鲨（学名：Squatina japonica）为扁鲨科扁鲨属的鱼类。

身体宽扁，长达2米余；锈褐色，具有暗色和白色斑点；口大端位；鳃孔宽大侧位；胸鳍宽大，臀鳍消失。

The Japanese angelshark (Squatina japonica) is a species of angel shark, family Squatinidae, found in the northwestern Pacific Ocean off China, Japan, and Korea. It is a bottom-dwelling shark found in sandy habitats down to 300 m (980 ft) deep. This species has the flattened shape with wing-like pectoral and pelvic fins typical of its family, and grows to 1.5 m (4.9 ft) or more in length. Its two dorsal fins are placed behind the pelvic fins, and a row of large thorns occurs along its dorsal midline. Its upper surface is cryptically patterned, with numerous squarish dark spots on a brown background.