The new bill pays tribute to the contributions and sacrifices of Canadian men and women in all military conflicts and is being released just before Remembrance Day.
The note features a view of the Canadian National Vimy Memorial on its back.
The bill will be formally introduced in a ceremony at the Canadian War Museum in Ottawa by Bank of Canada Governor Mark Carney, Finance Minister Jim Flaherty and Veterans Affairs Minister Steven Blaney.
The $20 is the country's mostly widely used bank note.
The Bank of Canada began issuing polymer money a year ago with a new $100 bill, followed by a $50 note in March.
New $5 and $10 notes are scheduled to be issued by the end of 2013.
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