Mustad is a surname. Notable people with the surname include:
Halfdan Magnus Mustad (1874–1967), Norwegian businessman Hans Mustad (1837–1918), Norwegian businessman Hans Clarin Hovind Mustad (1871–1948), Norwegian businessman Kristian Mauritz Mustad (1848–1913), Norwegian politician Nicolai Christian Mustad (1878–1970), Norwegian businessman and art collector Ole Hovelsen Mustad (1810–1884), Norwegian businessperson and politician Sigbjørn Mustad (1897–1970), Norwegian lawyer and politician