| Gran Rio | |
| Map: | Gran Rio & Pikin Rio.png |
| Map Size: | 260px |
| Mouth: | Upper Suriname River |
| Mouth Coordinates: | 4.0125°N -55.4797°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Suriname |
Gran Rio is a river of Suriname. The Gran Rio joins with the Pikin Rio to form the Upper Suriname River.[1] The river runs from the northern hills of the Eilerts de Haan Mountains. It has a stony bottom, forms many tiny islands and has many rapids.[2] [3] The river was first explored in 1908 by Eilerts de Haan to find the source of the Suriname River.[4]