Fagara externa is a species of flowering plant in the family Rutaceae.

It grows in lower montane myrtisilva (myrtle forests) from 400 to 700 meters elevation, where Myrceugenia schulzei is the dominant tree.

In 2006 it was estimated that there are 500 to 1,000 individuals on the island, with the largest concentration in the El Blindado sector.

In 2023 the IUCN Red List assessed the species as critically endangered.

[3][4][5] Plants of the World Online lists Fagara externa as an unplaced name.