Cy Marshall (April 17, 1902 in Kansas City, Missouri – December 20, 1974 in Volusia, Florida) was an American racecar driver. Marshall was seriously injured and his riding mechanic, brother Paul Marshall, was killed in the 1930 Indy 500. He returned to the race in 1947. The 17 years between starts is a record he shares with Roland Free who also competed in only the 1930 and 1947 races. Marshall also failed to qualify for the 1950 race.