William Wallen FSA (1807–1888) was an English architect who practised in London and Huddersfield, Yorkshire. He was also a campaigner for better architectural education and professional status.

John Wallen (1785–1865) was a 19th-century British architect and surveyor. He was the principal quantity surveyor in the City of London during the 1830s. Many of his former students, such as Edward I'Anson went on to have notable careers.