Dennis Sutton Horn (1909 – 1974) was an English male track cyclist. ^[1]

In the early 1920s Dennis and his older brother Cyril took up cycling, Cyril had represented Great Britain at two Olympic Games as a speed skater. Dennis became British champion when winning the British National Tandem Sprint Championships with John Sibbit in 1932. ^[2] He later won an individual title, winning the Sprint Championship at the 1938 British National Track Championships.

Dennis featured in a cigarette card published by Senior Service cigarettes (J. A. Pattreiouex Ltd) in 1935. It was no. 25 of a set of 96 entitled Sporting Events and Stars.They raced for Norwich ABC (Amateur Bicycle Club).