John M. Koster (born September 8, 1951) is a former American politician of the Republican Party. He is a former member of the Snohomish County Council and Washington House of Representatives. Koster has three times ran unsuccessfully for the United States House of Representatives in 2000, 2010, and 2012. During the 2012 election, Koster was asked after a campaign fundraiser on October 28, 2012, about exceptions from abortion prohibition for rape and incest victims.