Alli Hagar Olsson (16 September 1893 – 21 February 1978) was a Swedish-speaking Finnish writer, literary critic, playwright and translator.

In 1922 she edited an avant-garde literary magazine, Ultra.

[2] She also contributed to another avant-garde magazine Quosego.

[3] In 1965 she received the Eino Leino Prize.

This article about a Finnish writer or poet is a stub.