Jan Gajdoš (27 December 1903 – 19 November 1945) was a gymnast, representing Czechoslovakia.

Individually, he won no medals, but he finished fourth in the horizontal bar, and eighth in the rings.

In 1930, he took overall silver, behind Josip Primožič, and also won bronze in the pommel horse and rings.

[2] In his last World Championships, in 1938, he won gold both in the individual all-around and floor exercise, as well as top-8 place finishings on 4 of the 5 other apparatuses.

He died shortly after the end of World War II, after being put on a death march by the Nazi Germans.