Lost in Russia (Chinese: 囧妈; lit. 'awkward mother', Russian: Затерянные в России) is a 2020 Chinese comedy film co-written and directed by Xu Zheng, who also stars in the lead role. The film can be considered the third in the "Lost in" series by Xu Zheng, following Lost in Thailand and Lost in Hong Kong, although all three films' plot and characters are unrelated, and Xu himself has not confirmed a connection between the three films.

The film follows the story of an awkward journey to Russia of a manipulative mother and her middle-aged son who wanted to rebel and escape on the K3 train. The film premiered in China digitally on January 25, 2020, during the Chinese New Year.