The International Olympic Committee has implemented a sweeping ban prohibiting transgender women from competing in all female events at the Olympic Games or any other IOC-sanctioned competition. This new policy, effective immediately for the 2028 Los Angeles Olympics, mandates that eligibility for female categories be determined through a one-time genetic test. The move aligns with U.S. President Donald Trump's executive order on women's sports, though the IOC states it is not retroactive and excludes grassroots programs.

The policy aims to 'protect fairness, safety and integrity' in women's sports, citing biological advantages retained from male puberty, including three testosterone peaks that confer 'individual sex-based performance advantages' in strength, power and endurance events.