San Sebastián del Oeste is a town and municipality situated in the western region of the Mexican state of Jalisco. It is located at an elevation of approximately 1,480 metres (4,856 ft) above sea level.
The geographical coordinates for the area range between 20°39' 45" - 21°02' 30" N and 104°35' 00" - 104°51' 00" W. It serves as a recognized administrative division within the state.