Alexei Sancov (born 15 October 1999) is a Moldovan competitive swimmer. He competed in the men's 200 metre freestyle event at the 2016 Summer Olympics and placed 34th with a time of 1:48.85. On 2 July 2017, Sancov broke the World Junior record in the 200 meter free at 18 years old and won the gold medal at the European Junior Championships with a time of 1:47.00. That time broke the official World Junior Record at the time in this event, which currently stood at 1:47.10, held by American Maxime Rooney. Rooney swam that time at the 2015 US National Championships in San Antonio, Texas. Earlier in the European Junior Championships he took silver in the 100 meter free with a time of :49.01.