Bielski is a Polish-language toponymic surname derived from one of placenames derived from the adjective biały, "white": Biała, Białe, Bielsk, Bielsko.^[1] The Lithuanized form is Bielskis/Bielskiene/Bielskytė, Latvian: Beslkis, East Slavic: Belsky.

Notable people with the surname include:

• Bielski partisans, a World War II Jewish partisan group in German-occupied Poland led by four brothers:
  • Tuvia Bielski (1906–1987), a Jewish partisan of the Second World War and leader of the Bielski partisans; oldest of the four brothers
  • Asael Bielski (1908–1945), second oldest of the four brothers
  • Alexander Zeisal Bielski (nicknamed "Zus") (1912–1995), second youngest of the four brothers
  • Aron Bielski (born 1927), youngest of the four brothers

• The Bielski Brothers (book), a biography of the Bielski partisans written by Peter Duffy
• Defiance (2008 film), a film adaptation of Nechama Tec's eponymous book
• Defiance: The Bielski Partisans, a book about the Bielski partisans written by Nechama Tec

• Adi Bielski (born 1982), Israeli theatre and film actress
• Dick Bielski (1932–2023), American NFL football player and coach
• Henryk Bielski (1935–2025), Polish film director
• Joan Bielski (1923–2012), Australian activist
• Marcin Bielski (1495–1575), a Polish chronicler of the 16th Century
• Ze'ev Bielski (born 1949), Israeli Knesset member and former chairman of the Jewish Agency for Israel

• All pages with titles containing Bielski