| František Cejnar | |
| Birth Date: | 1917 |
| Birth Place: | Prague, Austria-Hungary |
| Frenchopenresult: | QF (1937, 1938) |
| Wimbledonresult: | QF (1938) |
| Wimbledondoublesresult: | QF (1938)[1] |
František Cejnar (1917 – 3 May 1965) was a Czechoslovak amateur tennis player in the 1930s.
Cejnar reached the quarterfinals of the French Open in 1937 and 1938 and Wimbledon in 1938.