William Bird (or Byrd) was an architect and monumental sculptor active, particularly in Oxford, England, in the 17th century. He was born in Gloucester, England and there served an eight year apprenticeship to the mason, Walter Nicholls. He is known to have worked in Oxford between 1647 and 1681. Thomas Wood was his apprentice.
Colvin, Howard, A Biographical Dictionary of British Architects 1600-1840, 3rd edition (New Haven and London: Yale University Press, 1995), pp. 203-204.