William Merrill Polk (born July 26, 1935) is an American former politician in the state of Washington. He served in the Washington House of Representatives as a Republican. He is also a former Speaker of the Washington House of Representatives.
In 1968, William Polk FAIA, started as a partner at a Seattle architectural firm which became Waldron Pomeroy Polk & Smith in 1975. Bill started his own practice as William Polk Associates in 1985 after spending 4 years as the Chief Operating Officer at the John Graham Company. He joined INNOVA Architects in 2011. He was the Principal in charge of the Seattle Office in Mercer Island.