| Pieter Merkus | |
| Office: | Governor-General of the Dutch East Indies |
| Term Start: | 1841 |
| Term End: | 1844 |
| Predecessor: | Carel Sirardus Willem van Hogendorp |
| Successor: | Joan Cornelis Reynst |
| Birth Date: | 1787 3, df=yes |
| Birth Place: | Naarden, Dutch Republic |
| Death Place: | Surabaya, Dutch East Indies |
Pieter Merkus (18 March 1787 – 2 August 1844) was a Dutch colonial administrator and Governor-General of the Dutch East Indies from 1841 to 1844.[1] He also served as governor of the Molucca Islands.[2]