Onstad is a Norwegian surname. Notable people with the surname include:Chris Onstad, American writer, cartoonist, and artist Erik Gjems-Onstad (1922–2011), Norwegian resistance member, lawyer, and politician Kari Onstad (1941–2020), Norwegian singer and actress Katrina Onstad, Canadian journalist and novelist Kenton Onstad, American politician, member of the North Dakota House of Representatives Kristian Flittie Onstad, Norwegian professional football defender Mike Ohnstad (1926–2026), American politician in Minnesota Niels Onstad (1909–1978), Norwegian shipping executive Oda Utsi Onstad, Norwegian long and triple jumper Ole Gjems-Onstad, Norwegian jurist Otto Onstad (1874–1961), American politician Pat Onstad, Canadian professional soccer goalkeeper