Lana Payne enjoyed a landslide re-election at Unifor's Constitutional Convention in Vancouver.
Her leadership team was also re-elected. Len Poirer will serve another term as National Secretary-Treasurer, while Ontario Regional Director Samia Hashi also returns.
Payne was first elected National President in 2022, the first woman to lead the union.
"We are a union," she said. "That means it takes all of us. We inspire each other. We stand up for each other. We show up for each other. When I say there is no labour peace if you attack our rights, I mean there will be no labour peace. And when I say we must protect Canadian jobs with everything we have, I mean exactly that."
Unifor represents 320,000 workers across Canada.