Reinholds Bērziņš (Russian: Ре́йнгольд Ио́сифович Бе́рзин, romanized: Reingold Iosifovich Berzin) (16 July 1888 - 19 March 1938) was a Latvian teacher, and later a rifleman and Soviet military leader.
Berzin was born on 16 July 1888 at Ķoņi Parish, Governorate of Livonia, Russian Empire (today – in Latvia, near the border with Estonia) in a family of farmworkers for-hire.
In 1924 he retired from the army and in 1927-37 worked for the military industry and the People's Commissariat of Land Cultivation of the Russian SFSR.
On December 10, 1937, Bērziņš, working at that time as the manager of the Agrotekhznaniye trust of the People's Commissariat of Agriculture of the RSFSR, was arrested.
On March 19, 1938, he was shot, after having been found guilty by the Military Collegium of the Supreme Court of the USSR at the Kommunarka firing range (Moscow Region).