The Taoiseach is in Canada for a bilateral meeting with the Canadian Prime Minister Mark Carney.
The two leaders are expected to discuss trade, Ukraine and Gaza.
US President Donald Trump's tariffs on Canada have cost Canadian exporters five billion dollars so far this year, and have soured relations between the two, as have President Trumps jibes about making Canada the 51st state.
Canadians have responded with informal boycotts of US goods.
The country is actively looking to make up those losses with expanded trade links elsewhere.
Exports to the EU have gone up 26% since Mr Trump returned to the White House.
Micheál Martin said Ireland will ratify the Canada Europe Trade Agreement in the Dáil in the coming months.
Its provisional application has already seen an increase in bilateral trade.
The wars in Ukraine and Gaza will also be discussed as Canada is a significant participant in international peacekeeping and humanitarian efforts.
