S. Frank Brock (c. 1882 – c. 1918 or later) was an American racing driver who participated in the 1914 Indianapolis 500.
[1][2] Brock is believed to have been born in New Hampshire.
Brock was believed lost at sea off the coast of England during a World War I naval accident, before later evidence supported his survival and relocation to California after the war.
[3][4]