Routhier is a surname. Notable people with the surname include:
Adolphe-Basile Routhier (1839–1920), Canadian judge, author, and lyricist Félix Routhier (1827–1891), Ontario businessman and political figure Karen Routhier (born 1991), Canadian ice dancer Marie Routhier, the owner and designer of IQ Sportswear Inc. in Newfoundland