Alexei Viktorovich Kasatonov (Russian: Алексей Викторович Касатонов; born 14 October 1959 in Leningrad, Soviet Union) is a retired Russian ice hockey defenceman, a long-time member of the Soviet Union national team.

On the international stage, Kasatonov won two golds (1984, 1988) and one silver (1980) in the Olympics, and five golds (1981, 1982, 1983, 1986, 1989) in the World Championships. On the club level, Kasatonov played for SKA Leningrad, CSKA Moscow, New Jersey Devils, Mighty Ducks of Anaheim, St. Louis Blues, and Boston Bruins. He was Anaheim's lone representative in the 45th National Hockey League All-Star Game.

After retiring from the NHL in 1996, following a shoulder injury in an AHL game for the Providence Bruins, Kasatonov returned to play one last season for his former soviet club HC CSKA Moscow. Due to the severity of the injury his playing days were now behind him as he chose to return to New Jersey and settle down with his wife and son. In 1998 Kasatonov was the general manager of the Russian Olympic Team that captured the Silver Medal in Nagano. After the Olympics he could not stay away from Hockey as he began to train his son and soon began coaching youth hockey in the Tri-State area, running his own weekly clinics in Staten Island for 7 years. In 2003 Kasatonov founded the Admirals Hockey Club which at its peak had 5 teams ranging from Squirts to Juniors. In 2004 Kasatonov accepted the Head Coaching position at Columbia University.

In 2008 Kasatonov moved back to Russia for a Head Coaching position at PHC Krylya Sovetov.

(2010) Kasatonov is back in Moscow as the Vice President of the HC CSKA Moscow Hockey Club. (2011-2012) Kasatonov became the Vice President and General Manager of CKA St. Petersburg of the KHL, the first club that he played for in the Soviet Union.