Viacheslav is a Slavonic masculine given name (also can be transliterated as Vyacheslav or Viatcheslav). Notable people with the name include:
Viacheslav Aliabiev (1934–2009), Ukrainian professional footballer
Viacheslav Belavkin (1946–2012), professor in applied mathematics at the University of Nottingham Viacheslav Chornovil (1937–1999), Ukrainian politician Viacheslav Datsik (born 1980), Russian former kickboxer and mixed martial artist Viacheslav Dinerchtein (born 1976), violist and promoter of novel and overlooked viola repertoire Viacheslav Dydyshko (born 1949), Belarusian chess Grandmaster (1995) Viacheslav Fetisov (born 1958), retired professional ice hockey defenseman Viacheslav Grachev (born 1973), Russian rugby union player Viacheslav Ivanovski (born 1975), Israeli Olympic weightlifter Viacheslav I of Kiev (1083–1154), Prince of Smolensk, Turov, Pereyaslavl, Peresopnitsa, Vyshgorod, and Grand Prince of Kiev Viacheslav Kravtsov (born 1987), Ukrainian basketball player Viacheslav Lampeev (1952–2003), former field hockey player from Tajikistan Viacheslav Lavrov (1958–2000), retired professional ice hockey player who played in the Soviet Hockey League Viacheslav Platonov (1939–2005), Russian volleyball player and coach Viacheslav Ragozin (1908–1962), Soviet chess Grandmaster, an International Arbiter of chess, and World Correspondence Chess Champion Viacheslav Samodurov (born 1974), Principal Dancer at the Royal Ballet, Covent Garden in London Viacheslav Senchenko (born 1977), professional boxer from Ukraine Viacheslav Solodukhin (1950–1980), retired professional ice hockey player who played in the Soviet Hockey League Viacheslav Stjazhkin, Russian chess player; father of Anna Styazhkina Viacheslav Suprunenko (born 1976), deputy of the Kiev City Council, member of the committee on the budget and the socio-economic development Viacheslav Tsugba (born 1944), third Prime Minister of the Republic of Abkhazia Viacheslav V. Nikulin ( since 1999), Russian mathematician Viacheslav Zagorodniuk (born 1972), former Ukrainian figure skater