| Rio Aranjuez | |
| Name Other: | Aranjuez River |
| Pushpin Map: | Costa Rica |
| Pushpin Map Caption: | Location of mouth |
| Subdivision Type1: | Country |
| Subdivision Name1: | Costa Rica |
| Subdivision Type2: | Region |
| Subdivision Name2: | Puntarenas |
The Aranjuez (pronounced as /es/) is a river in Costa Rica that has its source in the mountains and crosses the Guatusos province of Puntarenas. Its basin is about in area. It empties into the Gulf of Nicoya, in the Pacific Ocean. It takes its name from the ancient city of Aranjuez, which existed in the late 16th century. At the mouth of the river was the port of Ribera, in the place now called Pitahaya Vieja.[1]