Tremblay (French pronunciation: [tʁɑ̃blɛ]) is a French Toponymic surname, especially common in French-speaking Canada, that may refer to:

• Alfred Tremblay (1912-1975), Canadian prospector and explorer
• Amaryllis Tremblay, Canadian actress
• Amédée Tremblay (1876–1949), Canadian organist, composer, and music educator
• Arthur Tremblay (1917–1996), Canadian politician
• Benoît Tremblay (born 1948), Canadian politician
• Charles Tremblay (1930–2002), American Nordic combined skier
• Charles-Henri Tremblay, Canadian politician
• Clarisse Tremblay (1951-1999), Canadian poet and writer
• David Tremblay (born 1987), Canadian freestyle wrestler
• Émilie Fortin Tremblay (1872–1949), Canadian explorer
• Emma Tremblay (born 2004), Canadian actress
• Erica Tremblay (born 1980), Seneca–Cayuga American documentary film director
• Fannie Tremblay (1885-1970), stage name of Stéphanie Massey, Canadian performer
• François Leclerc du Tremblay (1577–1638), French friar and agent
• François-Louis Tremblay (born 1980), Canadian short track speed skater
• Gaston Tremblay (1924–1998), Canadian politician
• George Tremblay (1911–1982), Canadian-American pianist, composer, and author
• Gérald Tremblay (born 1942), Canadian politician and businessman
• Gerald R. Tremblay (born 1944), Canadian lawyer
• Ghyslain Tremblay (1951-2020), Canadian actor and comedian
• Gilles Tremblay (disambiguation), multiple people
• J.C. Tremblay (1939–1994), Canadian hockey player
• Jacob Tremblay (born 2006), Canadian actor
• Jacques Tremblay (disambiguation), multiple people
• Jean Tremblay (born 1948), Canadian businessman and politician
• Jean-Gaston Tremblay (1928-2011), Canadian religious leader
• Jean-Noël Tremblay (1926–2020), Canadian politician
• Johanne-Marie Tremblay (born 1950), Canadian actress
• John Paul Tremblay (born 1968), Canadian actor
• Kay Tremblay (1914–2005), Canadian dancer
• Karelle Tremblay (born 1996), Canadian film and television actress
• Kathy Tremblay (born 1982), Canadian triathlete
• Léonard Tremblay (1896–1968), Canadian politician
• Lise Tremblay, (born 1957), Canadian writer
• Lucie Blue Tremblay (born 1958), Canadian folk singer-songwriter
• Marc Tremblay, engineer at Microsoft
• Marcel Tremblay (disambiguation), multiple people
• Mario Tremblay (born 1956), Canadian hockey player and coach
• Mario Tremblay (aka MC Mario), Canadian disk jockey
• Michel Tremblay (politician) (born 1933), Canadian politician
• Michel Tremblay (born 1942), French Canadian novelist and playwright
• Monique Gagnon-Tremblay (born 1940), Canadian politician
• Paul G. Tremblay (born 1971), American author
• Pamphile Réal Du Tremblay (1879–1955), Quebec lawyer, businessman and politician
• Raymond D. Tremblay, Canadian writer
• Ray Condo (born Ray Tremblay) (1950–2004), Canadian musician and painter
• René Tremblay (1922–1968), Canadian politician
• Richard E. Tremblay (born 1944), Canadian psychologist
• Richard "Blaimert" Tremblay, Canadian television writer and producer
• Richard-Max Tremblay(born 1952), Canadian artist and photographer
• Roland Michel Tremblay (born 1972), Canadian author
• Rodrigue Tremblay (born 1939), Canadian economist, humanist and political figure
• Stéphan Tremblay (born 1973), Canadian politician
• Stéfanie Tremblay (born 1990), Canadian judoka
• Suzanne Tremblay (1937–2020), Canadian politician
• Véronyque Tremblay (born 1974), Canadian journalist and politician
• Yannick Tremblay (born 1975), Canadian ice hockey player