Fournier is a French surname describing the occupation of a baker who tends the fire of an oven or furnace, and is derived from the Latin furnarius.

Notable people with the surname include:

• Alain Fournier, computer graphics researcher
• Alain-Fournier (Henri-Alban Fournier), French writer
• Alphonse Fournier (1893–1961), Canadian politician
• Amédée Fournier, French bicycle racer
• Ángel Fournier, Cuban rower (1987–2023)
• Catherine Fournier (Canadian politician) (born 1992), Canadian politician
• Charles Fournier (born 1968), French politician
• Christophe Fournier, president of the Médecins Sans Frontières organisation
• Claude Fournier (1745–1825), a personality of the French Revolution, nicknamed l'Americain
• Claude Fournier (1931–2023), filmmaker
• Colin Fournier, professor of The Bartlett School of Architecture
• Edgar Fournier, Canadian politician
• Eduardo Fournier, Chilean football player
• Eugène Pierre Nicolas Fournier, French botanist
• Evan Fournier (born 1992), French basketball player in the National Basketball Association
• Francine Fournier, professional wrestling manager/valet
• François Fournier (disambiguation), multiple people
• Georges Fournier, French astronomer
• Ghislain Fournier, Canadian politician
• Guy Fournier (born 1931), author, playwright, and screenwriter
• Heraclio Alfaro Fournier (1893–1962), Spanish-born aviator
• Hubert Fournier (born 1967), French retired footballer
• Jack Fournier (1889–1973), first baseman in Major League Baseball
• Jack Fournier (1892–1966), Canadian ice hockey player
• Jacques Fournier (1285–1342), Bishop of Pamiers, who became Pope Benedict XII
• Jean Alfred Fournier (1832–1914), French dermatologist
• Jean-Claude Fournier, French comics artist
• Jean-Marc Fournier (born 1959), politician and a lawyer
• Joe Fournier (born 1983), British businessman and professional boxer
• Joseph Fournier de Belleval (1892–1945), French Canadian baritone
• Joseph Michel Fournier (1905–1992), Canadian politician
• Laurent Fournier (born 1964), football manager and former midfielder
• Marcel Fournier, sociologist
• Michel Fournier (born 1944), French parachutist and adventurer
• Michel Fournier (1945–2008), French cinematographer
• Michelle Fournier (born 1977), Canadian hammer thrower
• Naipes Heraclio Fournier, founder of Spanish playing card manufacturer Naipes Heraclio Fournier S.A.
• Narcisse Fournier (1809–1880), French journalist
• Pierre Fournier (1906–1986), French cellist
• Pierre Fournier (1949–2022), Canadian French-language comics creator
• Pierre Fournier (born 1952), French comics artist who works under the pseudonym Makyo
• Pierre Charles Fournier de Saint-Amant, French chess player
• Pierre Simon Fournier (1712–1768), French typographer
• Rafael Ángel Calderón Fournier (born 1949), President of Costa Rica from 1990 to 1994
• Rémi Fournier, French football player
• René Fournier, French professional racing cyclist
• René Fournier, French aircraft designer, known for Fournier RF 4
• Rift Fournier (1936–2013), American writer, screenwriter and television producer
• Robert Fournier-Sarlovèze, French politician and polo player
• Ron Fournier, American journalist
• Sarto Fournier (1908–1980), Canadian politician
• Sébastien Fournier (born 1971), Swiss football player
• Stephen Fournier (1852–1919), Canadian politician
• Télesphore Fournier (1823–1896), Canadian politician and jurist
• Vernel Fournier, jazz drummer
• William G. Fournier, Medal of Honor recipient