Gustaaf Deloor (24 June 1913 – 28 January 2002) was a Belgian road racing cyclist and the winner of the first two editions of the Vuelta a España in 1935 and 1936.

[1] The 1936 edition remains the slowest winning finish time of the Vuelta in 150:07:54, the race consisted of 22 stages with a total length of 4,407 km.

Deloor was professional from 1932 until 1939 when World War II caused the end of his career.

When Deloor returned from the war, he came back to a plundered house and decided to start a new life in the United States of America in 1949.

He worked as a mechanic until, in 1956, an affluent client helped him find a job at Cape Canaveral aerospace centre.