The two leaders met for several days aboard navy ships in Placentia Bay in August 1941.
The resulting joint declaration detailed the goals and aims of the Allied powers concerning the Second World War and the post-war world.
A reception to mark the anniversary is being held at the Crow’s Nest in St. John’s this evening.
Mark Browne, the parliamentary secretary for Tourism, Culture, Industry and Innovation Minister Christopher Mitchelmore, will represent the provincial government.
At the reception, there will be a video link to a presentation at Nathan Phillips Square in Toronto. Commemorative Atlantic Charter plaques have been donated by Jocelyn and Edward Badovinac and will be presented to Ontario Lt.-Gov. Elizabeth Dowdeswell.