Lafontaine, French for "the fountain", may refer to:

• Jean de La Fontaine (1621–1695), French fabulist, one of the most widely read French poets of the 17th century
• De Lafontaine (1655–1738), French ballerina
• Georg Wilhelm Lafontaine (1680–1745), German painter
• Ludolph Lafontaine (1704–1774), German painter
• August Lafontaine (1758–1831), German writer
• Albert Millaud (1844–1892), French journalist and playwright, who wrote under various pseudonyms, including "Lafontaine"
• Oskar Lafontaine (born 1943), German politician

• Lafontaine, Ontario, Canada
• Lafontaine, Quebec, Canada
• LaFontaine, a provincial electoral district in Quebec, Canada
• Lafontaine, Kansas, U.S.
• La Fontaine, Indiana, U.S.

• Lafontaine (electoral district), a former riding in Quebec, Canada
• Lafontaine (surname)
• Lafontaine Bellot, governor of Plaisance, Newfoundland from 1664 to 1667
• 5780 Lafontaine, a minor planet
• Hotel LaFontaine, Huntington, Indiana

• La Fontaine (disambiguation)
• LaFountain, surname
• Fountain (disambiguation)