William Washburn (1808–1890) was an architect and city councilor in Boston, Massachusetts, USA, in the mid-19th century. He designed Boston's National Theatre (1836), Revere House hotel (1847), Tremont Temple (1853) and Parker House hotel (1854). He served on the Boston Common Council from ward 6 in 1854 and 1855. He was chairman of the Boston Board of Aldermen in 1855.