Viktor Gruzenkin (sometimes spelled Viktor Grouzenkin) (born December 19, 1951) is a retired Soviet decathlete. His personal record in the decathlon is 8356 points, set in Kiev in 1984.^[1] On February 17–18, 1979 he set the world record in the Indoor Heptathlon at 5934 points, which he held for over a year, surpassing the record of Guido Kratschmer who had recently won the silver medal in the 1976 Olympics behind Bruce Jenner (now known as Caitlyn Jenner).^{[lower-alpha 1][3]}

He continued competing into the Masters division, winning the decathlon in the M45 division at the 1997 World Championships.^[4] His 7687 points from that meet is the current World Record.^[5]

In 1978 he had a leading role in the film Muzhskie Igry Na Svezhem Vozdukhe (roughly translated as "Men's Outdoor Play").^[6]

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