Los Baños Creek or Los Banos Creek, originally El Arroyo de los Baños, is a 40 miles (64 km) long tributary stream of the San Joaquin River in Merced County, California. From its source in the central Diablo Range it flows east into the Central Valley where it turns northeast to the west edge of Los Banos. From there Los Baños Creek heads north to Mud Slough, 2.5 miles (4 km) upstream from its confluence with the San Joaquin River.