The Ottawa Board of Control was an important part of the governance of Ottawa, Ontario from 1908 until 1980 when it was abolished. Through the 19th century Ottawa had been governed by a mayor and city council, but most councillors were only part-time and could spend only a few hours per week on municipal issues.
The board was elected across the entire city of Ottawa with the four candidates receiving the most votes being added to the board. The member of the board of control who received the most votes was also made deputy mayor, and was the legal successor to the mayor should they resign or die in office. The board of control was abolished in 1980 by the Ontario Municipal Board after a council vote for its abolition.