Pittosporum longisepalum is a tree in the family Pittosporaceae. The specific epithet longisepalum means 'long sepal'.
Pittosporum longisepalum grows up to tall. The leaves are elliptic and measure up to long. The are in .
Pittosporum longisepalum is native to Sulawesi and Borneo, where it is confined to Sabah. Its habitat is in submontane forests at elevations of .