Karlos May Nasar (Bulgarian: Карлос Насар; born 12 May 2004) is a Bulgarian weightlifter who is an Olympic, two-time World and two-time European champion and one of the youngest weightlifting world record holders ever.

At 18 years old, he broke the world record in the men's 89 kg Clean & Jerk event with 220 kg to win the Clean & Jerk event at the 2022 World Weightlifting Championships held in Bogotá, Colombia.

In 2021, at the age of 16, he competed at the European Weightlifting Championships in the 81 kg category,[5] winning the silver in the snatch and in the total and the gold medal in the clean & jerk portion with a new European record of 206 kg ER.

In April 2023, at just 18 years old, at the 2023 European Weightlifting Championships in Yerevan, Armenia, he won the gold medal in the Clean & Jerk and in the Total, and the silver medal in the Snatch in the 89-kilogram division, where he broke five world records.

As of 31.12.2024, still 20 years of age and fully eligible to compete on junior weightlifting level Karlos Nasar has set 10 senior world weightlifting records, each of these of course being also a valid junior world record for the respective category.