| Joan Cornelis Reynst | |
| Office: | Governor-General of the Dutch East Indies |
| Term Start: | 5 August 1844 |
| Term End: | 30 September 1845 |
| Predecessor: | Pieter Merkus |
| Successor: | Jan Jacob Rochussen |
| Birth Date: | 23 January 1798 |
| Birth Place: | Larenstein, near Velp, Batavian Republic |
| Death Place: | The Hague, Netherlands |
Joan Cornelis Reynst (23 January 1798 – 11 October 1871), member of the Reynst family, was acting Governor-General of the Dutch East Indies in 1844–1845.[1]