Erzsi Újvári (born Erzsébet Kassák) (14 July 1899, Érsekújvár-11 August 1940, Moscow) was a Hungarian poet.
In 1912 she moved to Budapest and got work in a textiles factory.
[1] Influenced by her brother she became involved in literature, and joined him in founding the avant-garde journals A Tett (1915–16) and MA.
[1] She married the poet Sándor Barta.
[2]: 27 Along with many other avant-garde writers, she left Hungary after the fall of the Hungarian Soviet Republic.