The Montreal world's fair held during Canada's 1967 centennial year was Expo 67.
Officially called the 1967 International and Universal Exposition, Expo 67 was a Category One world's fair held in Montreal from April 28 to October 29, 1967. It became Canada's main centennial celebration and presented the country as modern, inventive and internationally minded. Its theme was “Man and His World,” adapted from the title of Antoine de Saint-Exupéry's 1939 book.
The fair occupied several sites, including Saint Helen's Island, Île Notre-Dame and Cité du Havre. Major attractions included the Canadian, Soviet and United States pavilions, as well as Habitat 67, Moshe Safdie's experimental modular housing complex. The exhibition attracted nearly 55 million visits, an extraordinary figure for a country whose population was about 20 million at the time.
Expo 67 is often confused with Expo 70, held in Osaka, or Expo 86, held in Vancouver. Those were separate world's fairs in different years. Expo 67 also helped shape Montreal's identity: parts of the site survived as a later exhibition called Man and His World, and the city's Major League Baseball team, founded in 1968, took the name Expos from the fair.