Lost River Jr./Sr. High School

{{Use mdy dates|date=January 2025}}

{{Infobox school

| name = Lost River Jr./Sr. High School

| image =

| imagesize =

| streetaddress = 23330 Highway 50

| city = Merrill

| county = (Klamath County)

| state = Oregon

| zipcode = 97633

| country = US

| coordinates = {{coord|42.015755|-121.503457|type:edu_source:googlemaps_region:US-OR|display=inline,title}}

| type = Public High school (North America)

| district = Klamath County School District{{cite web|url=http://www.ode.state.or.us/pubs/directory/school-directory-september-2008.pdf |title=Oregon School Directory 2008-09 |publisher=Oregon Department of Education |pages=139 |accessdate=2009-05-28 |url-status=dead |archiveurl=https://web.archive.org/web/20110526202904/http://www.ode.state.or.us/pubs/directory/school-directory-september-2008.pdf |archivedate=2011-05-26 }}

| principal = Jaime Ongman

| grades = 7–12

| students = 240 (2023–2024){{NCES School ID|410702000511|school_name=Lost River High School|access_date=March 22, 2025|do_not_render=y|ref_name=NCES}}

| rival =

| ratio = 16.55

| teaching_staff = 14.50 (FTE)

| mascot = Raider{{Cite web|url=http://www.osaa.org/schools.aspx/LostRiver/|title = OSAA - Error}}

| mascot image =

| team_name =

| colors = Black and gold {{color box|black}} {{color box|gold}}

| conference = OSAA Southern Cascade League 2A-4

| newspaper =

| opened =

| homepage = {{URL|1=http://www.kcsd.k12.or.us/SectionIndex.asp?SectionID=77}}

}}

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.