Ranjit Singh of Punjab (1780–1839) was the founder and first maharaja of the Sikh Empire.

Ranjit Singh or Ranjeet Singh may also refer to:

• Ranjit Singh of Bharatpur (1745–1805), maharaja of the Bharatpur princely state in Rajasthan, India
• Ranjeet Singh (Indian politician) (1934–2019)
• Ranjit Singh (Odisha cricketer) (born 1994), Indian cricketer
• Ranjeet Singh (Pakistani politician)
• Ranjit Singh (politician), Indian politician
• Ranjit Singh (race walker) (born 1957), Indian Olympic race walker
• Ranjit Singh (runner), Indian 800m runner
• Ranjit Singh (volleyball), Indian volleyball player

• Maharaja Ranjit Singh (TV series), Indian television show
• Sher-e-Punjab: Maharaja Ranjit Singh, Indian television show
• Ranjit Singh (How I Met Your Mother character), fictional character in How I Met Your Mother
• Ranjit Singh, a series of crime fiction novels by British Indian writer A A Dhand
• Ranjit Singh Lobo, fictional character in the 1981 Indian film Bulundi, played by Danny Denzongpa
• Thakur Ranjit Singh, fictional character in the 1973 Indian film Dhund, played by Danny Denzongpa
• Major Ranjit Singh Gurung, fictional Indian Army major portrayed by Danny Denzongpa in the 1998 Indian film China Gate

• Ranjit, an Indian male given name
  • Ranjeet (given name), alternative form of the male given name
  • Ranjith, another alternative form of the male given name
• Singh, an Indian surname
• Ranjeeta (disambiguation), feminine form of the given name
• Ranjitsinhji (1872–1933), maharaja of the Indian princely state of Nawanagar from 1907 to 1933
• Ranj Singh (born 1979), British-Indian doctor and TV presenter
• Ranjit Singh Boparan (born 1966), British-Indian businessman
• Ranjit Singh Chautala (born 1945), Indian politician
• Ranjit Singh Dyal (1928–2012), Indian army officer and administrator
• Ranjeet Singh Judeo, Indian politician