Austin Leo Theriault (born January 23, 1994)[1] is an American professional stock car racing driver and politician who recently served in the Maine House of Representatives for the 1st district from 2022 to 2024.

He was the Republican nominee to be U.S. Representative for Maine's 2nd congressional district in 2024, and was defeated by incumbent Democrat Jared Golden.

He started the 2011 season in a second car for RPM Motorsports, but returned to the family team mid-season, scoring eight top-ten finishes en route to third place in points.

He became a development driver for Brad Keselowski Racing during the 2012 season, and switched focus to Super Late Models following the ACT season, making selected starts throughout the Southeast for BKR while running part-time in the PASS North Tour in 2013 and 2014.

[7][8] On June 13 of that year, he won his first ARCA race, in Theriault's first start at Michigan International Speedway.

[9] He almost won at New Hampshire Motor Speedway, Theriault's home track where he led late in the race before fading to 8th.

[10] On October 3, 2015, Theriault was involved in a huge crash at Las Vegas Motor Speedway when his BKR teammate Tyler Reddick got loose in turn 4 and clipped him, causing the race truck he was driving to hit nearly head on into the front stretch wall where there were no SAFER barriers installed.

Theriault's steering wheel collided with and destroyed his helmet,[11] and he eventually suffered a compression fracture in his lower back as a result of the crash.

On February 4, 2019, it was announced that Theriault would drive at least five races for RBR Enterprises, starting at Daytona.

On February 18, 2017, Theriault won his second ARCA race in the season opener at Daytona International Speedway.

[18] On September 22, 2017, Theriault won at Kentucky Speedway and mathematically clinched the ARCA Racing Series championship for 2017.

[20] On June 29, 2019, it was announced that Theriault would make his Monster Energy NASCAR Cup Series debut at New Hampshire Motor Speedway in July, driving the No.

[21] After qualifying 36th, he finished 35th in the Foxwoods Resort Casino 301 upon retiring with a rear end issue on lap 185.