Soda Lake is a shallow, ephemeral, alkali endorheic lake in the Carrizo Plain in southeastern San Luis Obispo County, California. The lake is located on the southwest side of the northern Carrizo Plain, east of San Luis Obispo. It can be reached by Soda Lake Road, which runs northwest–southeast between State Route 166 and State Route 58. The lake is at an elevation of and covers an area of about .