Glycosmis longisepala is a tree of Borneo in the family Rutaceae.

The specific epithet longisepala is from the Latin meaning "long sepal".

[3] Glycosmis longisepala grows as a small tree.

The subellipsoid fruits measure up to 0.75 cm (0.3 in) long.

[3] Glycosmis longisepala is endemic to Borneo where it is confined to Mount Pueh in Sarawak.