Fred Kenelm Nielsen (April 22, 1879 – January 12, 1963) was a Danish-American lawyer, diplomatic official, and college football coach. Nielsen served as the head football coach at the Maryland Agricultural College (now known as the University of Maryland) from 1905 to 1906, the George Washington University from 1907 to 1908, Georgetown University from 1910 to 1911, and the Catholic University of America from 1915 to 1916.