| Birth Date: | 1936 7, df=y |
| Birth Place: | Rotterdam, Netherlands |
| Death Place: | Heemstede, Netherlands |
| Height: | 1.91m (06.27feet) |
| Weight: | 110kg (240lb) |
| Sport: | Discus throw |
| Club: | Pro Patria, Rotterdam |
| Show-Medals: | yes |
Cornelis "Cees" Koch (16 July 1936 – 14 September 2021) was a Dutch discus thrower and shot putter. As a discus thrower, he competed at the 1960 and 1964 Summer Olympics and finished in 22nd and 17th place, respectively.
With a throw of 55.96m, he won a silver medal at the 1962 European Championships in Belgrade, behind Soviet Union's Vladimir Trusenyev (57.11m). In the late 1950s and early 1960s, Koch collected sixteen Dutch titles altogether, seven in shot put and nine in discus throw.