| Lost River Jr./Sr. High School | |
| Streetaddress: | 23330 Highway 50 |
| City: | Merrill |
| County: | (Klamath County) |
| State: | Oregon |
| Zipcode: | 97633 |
| Country: | US |
| Coordinates: | 42.0158°N -121.5035°W |
| Type: | Public High school (North America) |
| District: | Klamath County School District[1] |
| Principal: | Jaime Ongman |
| Grades: | 7–12 |
| Students: | 224 (2019–20) |
| Ratio: | 15.95 |
| Teaching Staff: | 14.04 (FTE) |
| Mascot: | Raider[2] |
| Colors: | Black and gold |
| Conference: | OSAA Southern Cascade League 2A-4 |
Lost River Jr./Sr. High School is a junior/senior public high school serving Merrill, Oregon and Malin, Oregon United States. It is named after the Lost River in Southern Oregon and Northern California.
Lost River is climbing academically and has young new teachers excited and ready to teach their curriculum. Lost River has a small student to teacher ratio, which allows more one on one time with the teachers.
Lost River's high school athletic program began around the time the school did. The mascot is known as the "Raider" and the team colors are black and gold.
The school is a member in good standing of the Oregon School Activities Association and participate in the Southern Cascade League. All teams currently play in Class 2A, based on school enrollment.