Fort Sage Mountains

{{Infobox mountain

| name= Fort Sage Mountains

| native_name=

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| country= United States

| subdivision1_type= States

| subdivision1= {{enum|Nevada|California}}

| subdivision2_type= Region

| subdivision3_type= Districts

| subdivision3= {{enum|Washoe County|Lassen County}}

| topo_map= State Line Peak

| topo_maker= USGS

| range_coordinates= {{coord|40|1|47.658|N|119|58|52.726|W|type:mountain_scale:300000|format=dms|display=inline,title}}

| highest=

| elevation_m= 2393

| coordinates=

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| map= California

| map_relief= yes

| map_size= 220

| map_caption= Location of Fort Sage Mountains on the border of California and Nevada{{cite gnis|id= 857992|name=Fort Sage Mountains|accessdate= 2009-05-04}}

}}

The Fort Sage Mountains are a mountain range running across the state borders in western Washoe County, Nevada and eastern Lassen County, California.