Cantor can mean:

• The Latin word for singer, e.g. the main singer of a cantus
• Hazzan, in Judaism, the English name for a professional singer who leads prayer services (Kantor is a frequently noted Jewish patronym)
• Cantor (church), an ecclesiastical officer leading liturgical music in several branches of the Christian Church
• Cantor (crater), a lunar crater

In mathematics Cantor may refer to:

• The Cantor set or Cantor dust
• The Cantor function
• The Cantor space

Cantor as a surname may refer to:

• Andrés Cantor, Spanish-language soccer announcer
• Brian Cantor, Vice-Chancellor of the University of York, UK
• David Cantor (born 1954), American actor and singer
• Eddie Cantor (1892-1964), American comedian, singer, actor, songwriter
• Eric Cantor (born 1963), American politician
• Georg Cantor (1845-1918), German mathematician, founder of set theory
• Moritz Cantor (1829-1929), German historian of mathematics
• Nancy Cantor, Chancellor and President of Syracuse University
• Norman Cantor (1929-2004), Canadian medievalist
• Theodore Edward Cantor (1809-1860), Danish biologist

Cantor is a shortened form of these names and terms:

• Cantor Fitzgerald, a financial services firm