Triest is a surname. Notable people with the surname include:
Anthonius Triest (1576–1657), Roman Catholic bishop of Bruges and of Ghent Howard Triest (1923–2016), German-born United States Army translator Joran Triest (born 1997), Belgian footballer Monika Triest (born 1941), Belgian academic, writer, and civil rights activist Petrus Joseph Triest (1760–1836), Belgian Roman Catholic priest Willard Gustav Triest (1905–1989), American civil engineer, son of Wolfgang Wolfgang Gustav Triest (c. 1863 – 1946), American civil engineer
See also Shirley Julian (1914–1995), also known as Shirley Triest, American visual artist