Buen is a Norwegian surname. Notable people with the surname include:
Anders Buen (1864–1933), Norwegian typographer, newspaper editor, trade unionist, and politician Hauk Buen (1933–2021), Norwegian hardingfele fiddler and fiddle maker Kari Buen (1938–2025), Norwegian sculptor Knut Buen (born 1948), Norwegian fiddler, composer, folklorist, and publisher
See also Buin-e Olya