Yak-Service Flight 9633, carrying the players and coaching staff of the ice hockey team Lokomotiv Yaroslavl, crashed on take-off near Yaroslavl, Russia, resulting in the deaths of 44 of the 45 people on board.

On 7 September 2011, YAK-Service Flight 9633 carrying players and coaching staff of the Lokomotiv Yaroslavl professional ice hockey team, crashed during take-off near Yaroslavl, Yaroslavl Oblast, Russia. All but one of the 45 people on board were killed. The aircraft overran the runway at Tunoshna Airport before briefly lifting off, striking an antenna mast, catching fire, and crashing on the bank of the Volga river. The tragedy is commonly known as the Lokomotiv hockey team disaster.

Hockey Club Lokomotiv, also known as Lokomotiv Yaroslavl, is a professional ice hockey club based in Yaroslavl, Russia. It is a member of the Tarasov Division in the Kontinental Hockey League (KHL). The name of the team is derived from its owner, Russian Railways, the national railroad operator.

Yaroslavl is a city and the administrative center of Yaroslavl Oblast, Russia, located 250 kilometers (160 mi) northeast of Moscow. The historic part of the city is a World Heritage Site, and is located at the confluence of the Volga and the Kotorosl rivers. It is part of the Golden Ring, a group of historic cities northeast of Moscow that have played an important role in Russian history. The population of the city at the 2021 census was 577,279.