| Jack Caesar | |
| Fullname: | John Francis Caesar |
| Birth Date: | 1917 1, df=yes |
| Birth Place: | Footscray, Victoria |
| Originalteam: | Ascot Vale |
| Height: | 165 cm |
| Weight: | 67 kg |
| Statsend: | 1942 |
| Years1: | 1938–42 |
| Club1: | Essendon |
| Games Goals1: | 75 (15) |
John Francis "Jules" Caesar (5 January 1917 – 18 June 2004) was an Australian rules footballer who played for Essendon in the Victorian Football League (VFL).
Recruited from Ascot Vale, Caesar was a wingman in Essendon's 1942 premiership team, after playing in a Grand Final loss the previous year. He fought in the Pacific Islands during the war and played at Yarraville when he returned in 1946.