| Rio Ruidoso | |
| Name Etymology: | Noisy River |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | New Mexico |
| Subdivision Type4: | Counties |
| Subdivision Name4: | Lincoln |
| Source1: | Sierra Blanca Mountains |
| Source1 Location: | Lincoln County |
| Source1 Coordinates: | 33.3369°N -105.7439°W |
| Source1 Elevation: | 2260m (7,420feet) |
| Mouth: | Rio Hondo (Southern New Mexico) |
| Mouth Location: | Hondo, New Mexico |
| Mouth Coordinates: | 33.3817°N -105.2714°W |
| Mouth Elevation: | 1615m (5,299feet) |
The Rio Ruidoso is a 30miles long river located in the Sierra Blanca and Sacramento Mountains in Lincoln County and Otero County, New Mexico in the United States and is part of the Rio Ruidoso Watershed. The Spanish term, río ruidoso, translated into English means literally "noisy river".
The headwaters of the Rio Ruidoso are located near the top of 11981feet Sierra Blanca Peak, in the rugged Sierra Blanca mountains, which is located within the Mescalero Apache Indian Reservation. The upper reaches of the river are divided into three forks, the longest of which is the North Fork of the Rio Ruidoso. It begins on the north side of Sierra Blanca at Ice Spring near the Ski Apache ski area. The south and middle forks begin on the south side of the mountain. They merge in Cow Canyon approximately 1miles west of the point at which the south fork merges with the north fork. From there, the river winds its way down through the Sacramento Mountains, which are part of the Lincoln National Forest and through the village of Ruidoso, which was named after the river. Just east of Ruidoso two major tributaries, Cedar Creek and Carrizo Creek flow into the Rio Ruidoso.
Along its 30miles course, the river drops 6000feet in elevation. Just west of Hondo, New Mexico the river merges with the Rio Bonito to form the Rio Hondo.
Several fish species live within the waters of the Rio Ruidoso, including: