Éthier (or "Ethier") is a surname. Notable people with the surname include:
Andre Ethier (born 1982), American baseball player Andre Ethier (musician) (born 1977), Canadian singer-songwriter and visual artist Denis Éthier (1926–2017), Canadian politician Joseph Arthur Calixte Éthier (1868–1936), Canadian politician Kathleen Ethier (fl. 2020), American communicable-disease administrator Michèle Lamquin-Éthier (born 1946), Canadian politician Viateur Éthier (1915–1976), Canadian businessman and politician