Smithson Valley is a neighborhood within the Canyon Lake census-designated place in Comal County, Texas, United States.

It is located within the Greater San Antonio area.

Smithson Valley is located on Farm to Market Road 311, 15 mi (24 km) northwest of New Braunfels in central Comal County.

[2] The climate in this area is characterized by hot, humid summers and generally mild to cool winters.

[2] It is also zoned for Bill Brown Elementary School.