Johannes Schwartz Brun (13 May 1891 – 24 July 1977) was a Norwegian businessperson, military officer and bridge champion. He was born in Fredrikstad as a son of Sven Busch Brun (1861–1916) and Signe Marie Friis Giebelhausen (1867–1949). He was married to Else Harder (1910–1951).