Hugo Urbahns (1890, Lieth – 1946, Stockholm) was a German communist revolutionary and politician.

[1] He was involved in the Communist Party of Germany (KPD) in the 1920s.

He was jailed for his role in the Hamburg Uprising of 1923, and spent time on hunger strike.

[2][3] He was expelled from the KPD in the late 1920s, and became a leader of the Leninbund, a left split from the KPD.

[4] For a time he had links with Leon Trotsky, but they drifted apart over a number of issues, including Urbahns' development of "third campist" positions that the Soviet Union was no longer a workers' state.