Iris Mittenaere beat 85 other hopefuls in the finale in the Philippines in the 65th edition of the three-hour show that focused on diversity and empowering women to overcome the struggles of life.
"I was very surprised I won, I feel blessed," said the 24-year-old, whose competition profile had described her goal as advocating for dental and oral hygiene if she won.
Having clinched the crown, Mittenaere said she wanted to go beyond that and promote education for children and young women.
"Miss Universe was a dream, every girl wants to be Miss Universe ... the stage is amazing, everything is amazing," she said, beaming throughout her victory news conference.
"I want to help people, I want to understand people, I want to meet people, that's why this is a dream for me."
Haiti's Raquel Pelissier was the first runner-up, while Andrea Tovar of Colombia placed second runner-up.