The 1966 Texas gubernatorial election was held on November 8, 1966, to elect the governor of Texas. Incumbent Democratic governor John Connally was easily reelected to a third term, winning 73% of the vote to Republican T. E. Kennerly's 26%. Connally swept all 254 counties in this election and was inaugurated for his third term on January 17, 1967.
The election is, to date, the last time that a candidate for Governor of Texas won more than 70% of the vote, as well as the last in which a candidate won every county. As of , Randall, Ochiltree, and Smith counties have not voted for the Democratic candidate since this election.