| Mayaro–Rio Claro | |
| Official Name: | Region of Mayaro–Rio Claro |
| Other Name: | MRCRC |
| Settlement Type: | Region |
| Subdivision Type: | Country |
| Subdivision Type1: | Historic Counties |
| Subdivision Name1: | Mayaro and Nariva |
| Subdivision Type2: | Former Regions |
| Subdivision Name2: | Mayaro Rio Claro |
| Subdivision Type3: | Coastline |
| Subdivision Name3: | Atlantic Ocean |
| Coordinates: | 10.2979°N -61.0067°W |
| Seat: | Mayaro |
| Seat Type: | Capital |
| Established Title: | Founded |
| Established Date: | 17 July 1992[1] |
| Area Total Km2: | 814 |
| Population As Of: | 2011 |
| Population Total: | 35,650 |
| Population Density Km2: | auto |
| Timezone1: | Atlantic Standard Time |
| Utc Offset1: | -4 |
| Timezone1 Dst: | -4 |
| Area Code: | +1 (868) 630, 644 |
Mayaro–Rio Claro is a region of Trinidad. The local government body is Mayaro–Rio Claro Regional Corporation, a Regional Corporation of Trinidad and Tobago. The region has a land area of . The Mayaro–Rio Claro Regional Corporation is headquartered in Rio Claro. Other towns include Mayaro.
The region possesses many beach front properties and Trinidad's largest reservoir of natural gas and crude oil along its eastern coast. It includes the Ortoire Block, an 184sqkm resource exploration area where Trinidad's largest onshore natural gas discovery was found in the Ortoire syncline.[2]
The Corporation's area of responsibility comprises 39 discrete communities. It has the second largest landmass of any Regional Corporation in Trinidad. The Regional Corporation is governed by the Municipal Corporation's Act No. 8 of 1992 and is one of fourteen such bodies under the Ministry of Local Government. Two of the 41 Trinidadian electoral districts are located in Mayaro–Rio Claro: Mayaro and Moruga/Tableland.