Loy may refer to:
People with the given name Loy or Loys or Loÿs:
- Saint Loy, better known as Saint Eligius
- Loy Allen Bowlin (1909-1995), outsider artist
- Loy Allen Jr. (born 1966), former NASCAR driver
- Loy Hanning, Major League Baseball pitcher in 1939 and 1942
- Loy W. Henderson (1892-1986), United States Foreign Service Officer
- Loy Hering, (c. 1484-1564), German Renaissance sculptor
- Loy Mendonsa (21st century), Indian film singer
- Loy Petersen (born 1945), retired American professional basketball player
- Loy Vaught (born 1968), retired American basketball player
- Loy F. Weaver (born 1942), politician from Louisiana, USA
- Loys of Gruuthuse (c. 1422-1492), better known as Lewis de Bruges, lord of Gruuthuse
- Loys Louis Bourgeois (composer) (c. 1510-1560), French composer and music theorist of the Renaissance
- Loÿs Delteil (1869-1927), a French engraver and lithographer, publisher, dealer, and art historian
People with the surname Loy or Loys:
- Angie Loy (born 1982), field hockey forward
- Brendan Loy (21st century), American blogger
- David Loy (born 1947), Buddhist philosopher
- Douglas Loy (born 1961), Professor of Materials Science & Engineering and Chemistry at University of Arizona
- Egon Loy (born 1931), German former professional football goalkeeper
- Frank E. Loy, an American diplomat and former United States Under Secretary of State for Global Affairs
- James Loy (born 1942), United States Coast Guard admiral, former TSA administrator, former Deputy Secretary of the U.S. Department of Homeland Security
- Julien Loy (born 1976), French triathlete
- Matthias Loy (1828-1915), American Lutheran theologian
- Mina Loy (1882-1966), artist, poet, playwright, novelist, futurist, actor, Christian Scientist, designer of lamps and bohemian
- Myrna Loy (1903-1993), American motion picture actress
- Nanni Loy (1925-1995), Italian film, theatre and TV director
- Rachel Loy (21st century), solo artist
- Rory Loy (born 1988), Scottish footballer
- Tristan Loy (born 1973), French long distance and marathon speed skater and inline speed skater
- Yap Ah Loy (1837-1885), regarded as the founding father of modern Kuala Lumpur
- François De Loys (1892-1935), Swiss oil geologist and discoverer of "Loy's Ape"
Other uses:
- Loy (gastropod), a genus of sea slugs within the superfamily Onchidoridoidea
- Loy, County Tyrone, a townland in County Tyrone, Northern Ireland
- Loy's Ape, an unconfirmed species of primate formally known as ameranthropoides loysi
- USS Loy (DE-160), a destroyer escort of the United States Navy
- Loy (spade), a type of spade once used for manual ploughing in Ireland