| Honorific Prefix: | General |
| Cor de Jager | |
| Office: | Chair of the NATO Military Committee |
| Term Start: | November 1983 |
| Term End: | 30 September 1986 |
| Predecessor: | Robert Hilborn Falls |
| Successor: | Wolfgang Altenburg |
| Office1: | Chiefs of the Defence Staff |
| Term Start1: | 1 November 1980 |
| Term End1: | 5 July 1983 |
| Predecessor1: | General Robbie Wijting |
| Successor1: | General Govert Huijser |
| Birth Name: | Cornelis de Jager |
| Birth Date: | 17 August 1925 |
| Birth Place: | Oostburg, Netherlands |
| Death Place: | Bosch en Duin, Netherlands |
| Allegiance: |  Netherlands |
| Serviceyears: | 1949-1986 |
| Rank: | General |
General Cornelis "Cor" de Jager (17 August 1925 – 1 December 2001) was an officer of the Royal Netherlands Army, Chief of the Defence Staff from 1980 to 1983 and Chairman of the NATO Military Committee from 1983 to 1986.[1]