Mensa may refer to:

• Mensa International, an organization for people with a high intelligence quotient (IQ)
• Mensa (constellation), a southern star constellation
• Mensa (geology), an extraterrestrial area of raised land
• Mensa Music, a record label in partnership with Aquarius Records

Mensa is the largest and oldest high IQ society in the world. It is a non-profit organization open to people who score at the 98th percentile or higher on a standardised, supervised IQ or other approved intelligence test. Mensa is formally composed of national groups and the umbrella organisation Mensa International, with a registered office in Caythorpe, Lincolnshire, England, United Kingdom.