Flora Unionis Rerumpublicarum Sovieticarum Socialisticarum
- Title: Flora Unionis Rerumpublicarum Sovieticarum Socialisticarum
- Abbreviation: Fl. URSS
- Author: Vladímir Leóntievich Komarov
- Publication: 1934–1964 in 30 volumes
- Publisher: Akademii Nauk SSSR
- City: Leningrad
V. L. Komarov edited volumes 1-13; later volumes were edited by B. K. Schischkin & E. Bobrov. In 1963 the Israel program for scientific publications began translation into English of this flora; the translation is publ. as Flora of the U.S.S.R. (Flora SSSR).