Blair Lawrence has been elected to replace long-time councillor Merrill Henderson.
In a byelection held Monday, Lawrence beat Mike Dawson with 1,367 votes to 771 votes.
Moncton City Council held the byelection to replace Henderson, who died on March 17.
In New Brunswick, provincial law only allows byelections to be held in May or December.
Council made the decision to request a May byelection because three councillors are running in the provincial election in September.