The five-term North Vancouver city councillor succeeds Moe Sihota, a former provincial cabinet minister, who held the post for four years.
On Sunday, Keating said his key priorities include modernizing the party database, reinvigorating British Columbians to get engaged in the political process, and ensuring that the B.C. Liberals are held to account.
"Top of mind for B.C. New Democrats right now is renewal," Keating said in a statement.
"I look forward to working to bring people together in that process while at the same time helping the party organization reach its overarching strategic goals."
New Democrats made their choice at their convention in Vancouver Sunday, where the major topic of discussion has been last May's surprising and devastating B.C. election defeat.
The party blew a 20-point lead in the polls and lost to Premier Christy Clark's Liberals.
On Saturday, Dix described this as a tough time for the NDP, and said one of the biggest challenges facing the party is overcoming cynicism. He also vowed a new leader can and will win the next provincial election.
The party is expected to discuss a date for a leadership election, but no decision will be announced today.