Thomas Bickerstaff Harper Ellis (December 1911 – March 1988) was a senior partner in the architectural firm Lyons, Israel and Ellis. The work of Ellis and his partners is noteworthy for both the collection of buildings they designed and for their influence on the group of architects who worked for the partnership. When English Heritage listed one of their buildings in 2006 they described the Lyons, Israel and Ellis partnership as 'one of the most influential post-war practices specialising in education, public housing and healthcare'.