Sandarmokh (Сандармох; Karelian: Sandarmoh) is a forest massif 12 km (7.5 mi) from Medvezhyegorsk in the Republic of Karelia where an unknown number, estimated in the thousands, of victims of Stalin's Great Terror were executed. More than 58 nationalities were shot and buried there by the NKVD in 236 communal pits over a 14-month period in 1937 and 1938.

1000 victims were from the Solovki special prison in the White Sea. It was long thought that the barges carrying them were deliberately sunk on the way to the mainland, drowning all the prisoners on board. Others were rounded up during the Great Terror in Karelia, in accordance with quotas for prisoners, 'enemies of the regime', and a variety of "national operations". According to available documentation at least 6,000 were shot and buried at Sandarmokh.

Today Sandarmokh is a memorial to the crimes of Stalin and his regime and since 1998 has been the focus of an international Day of Remembrance on 5 August every year.