Trudeau appeared at the United Nations in New York on Wednesday to further his work on gender equality.
The newly-elected Liberal Party leader unveiled his first cabinet in November with an equal number of men and women taking ministerial posts.
Trudeau said: "First of all, I’m going to keep saying loud and clearly that I am a feminist.
"Until it is met with a shrug.
"Why does every time I say I’m a feminist the Twittersphere explodes and news media pick it up?
"It shouldn’t be something that creates a reaction."
He continued: "It’s simply saying I believe in equality of men and women and I believe we still have an awful lot of work to do to get there."
He was met with rapturous applause by the audience at the UN women's summit.
Watch video of his speech, above.
Trudeau made good on a campaign promise to instill greater gender equality in his government.
And he gave a simple three word answer, described as a 'drop mic moment', when asked by a reporter why it's important to build a Cabinet with gender parity in mind, stating simply: "Because it's 2015".