| Native Name: | Петар Недељковић |
| Native Name Lang: | sr |
| Birth Date: | 9 August 1882 |
| Allegiance: | Kingdom of Yugoslavia |
| Branch: | Royal Yugoslav Army |
| Rank: | Army general |
| Commands: | 4th Army |
| Battles: |
Petar Nedeljković (9 August 1882 – 1 November 1955) was an army general in the Royal Yugoslav Army who commanded the 4th Army during the German-led invasion of Yugoslavia of April 1941 during World War II. Nedeljković's command consisted of three divisions, a brigade-strength infantry detachment, one horsed cavalry regiment and one infantry regiment. The 4th Army was responsible for the Yugoslav-Hungarian border and was deployed behind the Drava between Varaždin and Slatina.
Nedeljković commanded a division in 1936, and was then appointed as Inspector of Cavalry. He was appointed to command the 3rd Army headquartered at Skopje in May 1939.