Cournoyer is a surname of French Canadian origin, denoting someone who lived at a farm with a walnut tree. Notable people with the surname include:
Charle Cournoyer (born 1991), Canadian skater Chris Cournoyer (born 1970), American politician Ève Cournoyer (1969–2012), Canadian singer-songwriter Gérard Cournoyer (1912–1973), Canadian politician and lawyer Jean Cournoyer (born 1934), Canadian politician Jimmy Cournoyer (born 1979), Canadian drug trafficker Julie Cournoyer (born 1970/71), Canadian para-cyclist Michèle Cournoyer (born 1943), Canadian animator Normand Cournoyer (born 1951), Canadian ice hockey player Réjean Cournoyer (born 1971), Canadian actor and singer René Cournoyer (born 1997), Canadian artistic gymnast Yvan Cournoyer (born 1943), Canadian ice hockey player