Ottawa SuperEX was an eleven-day annual exhibition that took place every August at Lansdowne Park in Ottawa, Ontario. The exhibition provided exhibits, entertainment and amusements indoors in the buildings on site and outdoors on the grounds. The Central Canada Exhibition Association operated a fair annually from 1888 until 2010, except during World War II. The fair was on hiatus due to plans to redevelop Lansdowne Park and the Association continued to work towards finding opportunities to bring back SuperEX. It was announced in December 2015 that the Ottawa SuperEX board had disbanded a year earlier and the Ex would not be returning.

Lansdowne Park is a 40-acre (16 ha) urban park, historic sports, exhibition and entertainment facility in Ottawa, Ontario, Canada, owned by the City of Ottawa. It is located on Bank Street adjacent to the Rideau Canal in The Glebe neighbourhood of central Ottawa. Lansdowne Park contains the TD Place Stadium and Arena complex, the Aberdeen Pavilion, and the Horticulture Building.