Châteauguay—Lacolle is a new federal electoral district in Quebec. It encompasses a portion of Quebec formerly included in the electoral districts of Beauharnois—Salaberry and Châteauguay—Saint-Constant.

Châteauguay—Lacolle was created by the 2012 federal electoral boundaries redistribution and was legally defined in the 2013 representation order. It came into effect upon the call of the 42nd Canadian federal election, scheduled for 19 October 2015.

The NDP did well across the riding in 2011. However, it did slightly better in the population centres than in the more rural portions of the district, particularly in the centre of the riding. The Liberals and Conservatives did better in the more Anglophone city of Châteauguay than in other portions of the riding. The Bloc was a strong second in much of the region, trailing the NDP, although it did not have any specific regions in which it was particularly strong in comparison to its overall result. The Bloc was weaker, however, in the city of Châteauguay. The riding was swept up in the Liberal wave of 2015, although the three major contenders in the riding (Liberals, Bloc, NDP) all enjoy relatively strong support overall.

This riding has elected the following Members of Parliament:

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