| Mariscal Ramón Castilla | |
| Settlement Type: | Province |
| Subdivision Type: | Country |
| Subdivision Name: | Peru |
| Subdivision Type1: | Region |
| Subdivision Name1: | Loreto |
| Established Title: | Founded |
| Established Date: | October 18, 1979 |
| Seat Type: | Capital |
| Seat: | Caballococha |
| Leader Title: | Mayor |
| Leader Name: | Gregorio León Quispe Sánchez |
| Area Total Km2: | 37412.94 |
| Elevation M: | 84 |
| Population Total: | 55294 |
| Population Density Km2: | auto |
| Blank Name Sec1: | UBIGEO |
| Blank Info Sec1: | 1604 |
The Mariscal Ramón Castilla Province (Spanish mariscal marshal, "Marshall Ramón Castilla") is one of the eight provinces in the Loreto Region of Peru. It was created by Law No. 22728 on October 18, 1979 by President Francisco Morales Bermúdez. The province was named after Ramón Castilla.
Its territory is mostly flat and covered by the Amazon Rainforest.
The province is divided into four districts.