Tim O'Brien is a member of the Indiana House of Representatives, representing District 78. He assumed office on March 30, 2021. His current term ends on November 4, 2026. O'Brien is running for re-election to the Indiana House of Representatives to represent District 78. He is on the ballot in the Republican primary on May 5, 2026. O'Brien was appointed to the seat in 2021, following the appointment of Holli Sullivan as Indiana Secretary of State.