Mariia Vynnyk (; born 27 November 2001) is a Ukrainian freestyle wrestler. She is the silver medalist of the 2025 World Wrestling Championships in the 59 kg category and a 2023 Ukrainian national champion. She holds the title of International Master of Sports of Ukraine.
Vynnyk first rose to prominence at the junior level, winning bronze medals at both the 2019 World Junior and European Junior Championships in the 50 kg category.
In April 2021, she placed fifth at the European Championships, narrowly missing bronze against German wrestler Annika Wendle. The following month, she won bronze at the European U23 Championships and later that year also claimed bronze at the 2021 World U23 Championships in Belgrade.
She became the Ukrainian national champion in 2023 in the 53 kg category, defeating Yana Soroka in the final. In 2024, she won silver at the European U23 Championships in the 55 kg category.
At the 2025 World Wrestling Championships in Zagreb, Croatia, Vynnyk competed in the women's freestyle 59 kg division and won the silver medal.
She has a twin sister, Solomiia Vynnyk, who is also a wrestler. Both began wrestling at age seven after being enrolled by their mother. Following the tragic death of their parents in a car accident, they were raised by their grandparents. Mariia is a student at the Lviv College of Sport.