Thatcher is an unincorporated historic community in Washington County, Oregon, United States. It was located approximately three miles north of Forest Grove at the intersection of Hillside and Thatcher roads. The area is part of the Forest Grove Rural Fire Protection District. The community was named after pioneers Harmon and Jemima Thatcher, who came from Indiana soon after their marriage in 1847, first settling in Yamhill County, and later taking up a Donation Land Claim in the area that now bears their name.