William Wallen

William Wallen may refer to:


 * William Wallén (born 1991), Swedish ice hockey forward
 * William Wallen Sr. (1790–1873), English architect and surveyor in London
 * William Wallen Jr. (1817–1891), English architect and surveyor in London
 * William Wallen (architect, born 1807) (1807–1888), English architect who practiced in London and Huddersfield, Yorkshire