Smithwick is an unincorporated community in Burnet County, Texas, United States.

A post office was established here in 1871 and remained in operation until 1926, after which mail was sent to the community via Marble Falls.

When the Austin and Northwestern Railroad completed a track to Marble Falls in 1889, the community declined drastically.

[2] Smithwick is located on Ranch to Market Road 1431, eight miles east of Marble Falls.

Elm Grove was described as a school community located near Post Oak Creek.