Bjørnstad is a Norwegian surname. Notable people with the surname include:
Alfred William Bjornstad (1874–1934), American army officer Anders Bjørnstad, Norwegian jazz trumpeter Andreas Skår Bjørnstad, Paralypmic swimmer Anne Bjørnstad, Norwegian screenwriter, co-creator of TV series Lilyhammer, Beforeigners, and others Eric Bjornstad (1934–2014), American climber and author Espen Bjørnstad, Norwegian skier Hans Bjørnstad (1928–2007), Norwegian ski jumper Helge Bjørnstad (born 1971), Norwegian ice sledge hockey player Henrik Bjørnstad (born 1979), Norwegian professional golfer Ivar Loe Bjørnstad, Norwegian jazz and rock drummer John Bjørnstad (1888–1968), Norwegian rower Jørgen Bjørnstad (1894–1942), Norwegian gymnast Ketil Bjørnstad (born 1952), Norwegian pianist and composer Ola Bjørnstad, Norwegian forester and civil servant Olaf B. Bjørnstad (1931–2013), Norwegian former ski jumper Olav Bjørnstad (1882–1963), Norwegian rower Roar Theodor Bjørnstad, after whom Björnstad syndrome was named Roy Bjørnstad (1925–2005), Norwegian actor Sivert Bjørnstad (born c.1990), Norwegian politician Svenn Erik Bjørnstad (born 1971), former Norwegian ice hockey player Tor Halvor Bjørnstad, Norwegian retired cross-country skier Victoria Hæstad Bjørnstad (born 1999), a Norwegian orienteer Vidar Bjørnstad (born 1955), Norwegian politician for the Labour Party
See also Anthene bjoernstadi, or Bjørnstad's hairtail, a butterfly