Andrewsianthus is a genus of liverworts in the family Lophoziaceae.
The genus has a cosmopolitan distribution, mainly in the Southern Hemisphere.
It was originally published by in Rev. Bryol. Lichénol. 30: 66 in 1961.
The genus name of Andrewsianthus is in honour of Albert LeRoy Andrews (1878-1962) an American professor of Germanic philology and an avocational bryologist, known as "one of the worldâÂÂs foremost bryologists and the American authority on Sphagnaceae.
Between 19, and 24 species are known: