Boas might refer to:
in people:
- Abraham Tobias Boas (1844–1923), Australian rabbi
- André Vilas Boas (born 1983), Portuguese footballer
- André Villas-Boas (born 1977), Portuguese football manager
- Antonio Villas Boas (1934–1992), Brazilian alien abduction claimant
- Carlos Thorne Boas (born 1923), Peruvian novelist, writer and lawyer
- Ernst Philip Boas (1891–1955), American physician
- Franz Boas (1858–1942), German-American anthropologist
- Frederick S. Boas (1862–1957), English drama scholar
- George Boas (1891–1980), American philosopher
- Harold Boas (1883–1980), Australian town planner and architect
- Harold P. Boas (born 1954), American mathematician
- Ismar Isidor Boas (1858–1938), German gastroenterologist
- Johan Erik Vesti Boas (1855–1935), Danish zoologist
- Kléber Boas (born 1975), Brazilian footballer
- Mary L. Boas (1917-2010) American mathematician and physics teacher
- Ralph P. Boas, Jr (1912–1992), American mathematician
- Roger Boas, American politician
in other:
- boa (plural), snake
- Boas' sign, pain below the right shoulder