Beletski or Beletsky (feminine, in Russian: Beletskaya) is a Russian-language surname. It Polish counterpart is Bielecki, Ukrainian: Biletskyi, Biletskyy.

The surname may refer to:

• Alexei Beletski (born 1979), Israeli ice dancer
• Irina Beletskaya (born 1933), Russian chemist
• Stepan Petrovich Beletsky, statesman and head of the Police Department in the Russian Empire
• Viktor Beletsky, Soviet diplomat
• Monica Beletsky, American television producer and screenwriter

• 66th Fighter Wing (Air National Guard)
• 66th Fighter Wing (World War II)
• 66th Guards Rifle Division
• 66th Guards Training Motor Rifle Division
• 66th Honinbo
• 66th Indiana Infantry Regiment
• 66th Infantry Regiment
• 66th Infantry Regiment (disambiguation)
• 66th Infantry Regiment (Imperial Japanese Army)
• 66th Infantry Regiment (United States)
• 66th Military Intelligence Brigade (United States)
• 66th Nations Cup
• 66th New York State Legislature
• 66th New York Volunteer Infantry
• 66th pope
• 66th Primetime Creative Arts Emmy Awards
• 66th Primetime Emmy Awards
• 66th Rifle Division
• 66th Scripps National Spelling Bee
• 66th Session of the United Nations General Assembly
• 66th Street (disambiguation)
• 66th Tactical Reconnaissance Group
• 66th Tank Division (Soviet Union)
• 66th Texas Legislature
• 66th Theater Aviation Command (United States)