German army officer and chief organizer of Adolf Hitler (Hitler, Adolf)'s storm troops (Sturmabteilung, or SA; Brownshirts). Feared as a rival by Hitler, he was murdered at the Führer's order.

A soldier from 1906, Röhm was wounded three times in World War I, during which he attained the rank of major. After the war he helped to found, before Hitler, the Nazi Party. Röhm helped Hitler win the support of the army in Bavaria and made available to him his private strong-arm force, which, in October 1921, became the Sturmabteilung. For his part in the Beer Hall Putsch of November 8–9, 1923, in Munich, Röhm was briefly imprisoned.

Röhm wanted the SA to absorb or supplant the Reichswehr (regular army) and to secure equality with the Nazi Party, contrary to Hitler's wishes. In 1925 Röhm went to Bolivia, returning late in 1930 at Hitler's request to reorganize the SA. After Hitler became chancellor in 1933, he temporized by including Röhm in his cabinet but then subordinated the SA to the party and the army. Persuaded by Hermann Göring (Göring, Hermann) and Heinrich Himmler (Himmler, Heinrich), Hitler finally decided to purge the SA chief. Röhm was taken by Hitler personally from a hotel near Munich on the pretext that he and the SA were preparing a putsch. Röhm was shot without trial the next day.