Bob Tiernan is an American politician who served in the Oregon House of Representatives, representing Oregon's 24th district, which included most of Lake Oswego and portions of southwestern Portland. He is a Republican, and served as chair of the state party from 2009 to 2011.
He earned a Bachelor of Science degree from Oregon State University, a law degree from the University of Puget Sound, and a Master of Laws degree from Georgetown University.
In 1992, he was elected to the Oregon House and served 2 two-year terms. In 1996, he lost to his 1994 opponent, Richard Devlin. In 2002, he ran for the Oregon State Senate to represent the 19th senate district, again facing Devlin, narrowly losing by a margin of 47% to 50%.
He served as chief petitioners on several successful statewide ballot measures, including Measure 11 (mandatory minimum sentences), Measure 8 (pension reform), and Measure 17 (prison labor), all in 1994.
In January 2009, he was elected as chair of the Oregon Republican Party and served until 2011, when he was succeeded by Allen Alley.
Tiernan and his wife Susan live in Lake Oswego. They have two adult children, and one teenager.