Once registered, Forces et Démocratie would be the sixth federal party with MPs currently sitting in the House of Commons.
Ex-Bloc Québécois MP Jean-François Fortin, who has been sitting as an Independent since the summer, represents the riding of Haute-Gaspésie-La Mitis-Matane-Matapédia.
Newly defected New Democrat Jean-François Larose represents the riding of Repentigny.
In a press release announcing their intentions, the MPs say Forces et Démocratie will better serve their constituents priorities.
The current parties have lost sight of what's essential, the release says in French. All regions of Quebec, including Greater Montreal, feel "forgotten, overlooked, or even clearly despised" by the federal government, the statement says.
When he left the Bloc to sit as an Independent in August, Fortin said he was considering creating a new party.
Fortin was one of two MPs to leave the sovereigntist party after the election of its new leader, Mario Beaulieu, in June.
'Disloyalty and betrayal' to Layton's memory
The NDP reacted quickly to losing another MP, issuing a strong statement of its own.
“This is a clear-cut act of disloyalty and betrayal of the memory of Jack Layton, along with the democratic choice of Repentigny voters,” said MP Robert Aubin, who chairs the party's Quebec caucus.
The party says Larose must resign his seat and run again in a byelection if he wants to represent another party in the Commons. He voted in favour of a bill requiring resignation for floor-crossers in the past, New Democrats say.
Only two BQ MPs remain in the House of Commons. One of them, another former New Democrat, does not plan to run in the next election.