District 12 of the Texas Senate is a senatorial district that currently serves all of Wise County, and portions of Dallas, Denton and Tarrant counties in the U.S. state of Texas.

[1] The current senator from District 12 is Tan Parker.

District 12 has a population of 818,893 with 588,816 that is at voting age from the 2010 census.

[2]