Renier or Rénier may refer to:
Given name:
- Renier Botha (born 1992), South African rugby union player
- Renier Coetzee PS, General Officer in the South African Army
- François Renier Duminy (1747–1811), French mariner, navigator, cartographer and South African pioneer
- Renier Erasmus, South African rugby union player
- Renier de Huy, 12th-century metalworker and sculptor
- Renier of St Laurent (died 1188), twelfth-century Benedictine monk of St Laurent Abbey, Liège
- Giustina Renier Michiel (1755–1832), aristocratic woman who helped intellectual and social Venetian life flourish
- Renier I of Montferrat (1084–1135), ruler of the state of Montferrat in north-west Italy from about 1100 to his death
- Renier of Montferrat (1162–1183), the fifth son of William V of Montferrat and Judith of Babenberg
- Renier Schoeman (born 1983), South African rugby union player
- Jan Renier Snieders (1812–1888), Flemish writer, brother of August Snieders
- Renier of Trit, the first Frankish duke of Philippopolis (modern Plovdiv, Bulgaria) from 1204 to 1205
- Renier van Tzum (1600–1670), merchant/trader and official of the Dutch East India Company
- Renier Vázquez (born 1979), Spanish chess player, Grand Master in 2007
- Renier Zen (died 1268), the 45th Doge of Venice, reigning from January 1, 1253, until his death in 1268
Surname:
- Alphonse Renier, Belgian football player who competed in the 1900 Olympic Games
- Ferdinand Renier, Belgian weightlifter
- Franck Rénier (born 1974), French professional road bicycle racer
- G. J. Renier (1892–1962), professor of Dutch History at University College London
- Jérémie Renier (born 1981), Belgian actor
- Joseph Emile Renier (1887–1966) American sculptor, professor and medalist
- Marc Renier (born 1953), former Belgian racing cyclist
- Paolo Renier (1710–1789), Venetian statesman, the 119th, and penultimate, Doge of Venice
- Pascal Renier (born 1971), Belgian football defender
- Yannick Renier (born 1975), Belgian actor in theatre, film and television
Geography:
- Renier Point (6094–6094), the east extremity of both Burgas Peninsula and Livingston Island in the South Shetland Islands, Antarctica