The 1990 Texas Attorney General election took place on November 6, 1990, to elect the Texas Attorney General. Incumbent Democratic Attorney General Jim Mattox chose not to seek re-election to a third term, instead choosing to run for governor. In the Democratic primary, Dan Morales, a state representative from San Antonio, narrowly defeated Houston lawyer Odam. In the Republican primary, J.E. "Buster" Brown, a state senator from Lack Jackson, defeated three other candidates, avoiding a runoff against state representative Patricia Hill by just 637 votes.
In the general election, Morales narrowly defeated Brown by a margin of 6.8 percentage points.