Amur-Lena Offensive
Part of the Soviet Eastern Front of Great Patriotic War (from 1941)
Japanese-troops Russian-civil-war
Japanese troops enter Vladivostok in 1940.
Date 22 June 1941 (1941-06-22) – 2 December 1941 (1941-12-02)
(5 months, 1 week and 3 days)
Location Manchuria, Siberia, Mongolia
Result Strategic Japanese victory. Tactical Soviet victory

The Amur–Lena Offensive was a Imperial Japanese Army operation on the Far East Front in the Asian Theatre of Great Patriotic War. It took place between 22 June and 2 December 1941. The offensive took Japanese forces from their start lines on the Amur River almost 2704 mi (4352 km) to the Lena River; where the Russian Sakha Republic capital of Yakutsk is located.