Robert Soblen (born Sobolevicius; November 7, 1900 – September 11, 1962) was a prominent member of the pro-Trotsky Left Opposition in Germany in the 1930s. He moved to the United States in 1941 with his brother Jack Soble, and was arrested in 1960 as a Soviet spy. Convicted and sentenced to life in prison, he fled the United States while on bail and sought asylum first in Israel, then in Britain. He committed suicide by overdosing on barbiturates when his last appeal for asylum in Britain was denied.