Alexa Efraimson (born February 20, 1997) is an American professional middle distance runner from Camas, Washington who competes for Nike.
During the 2014 indoor and outdoor season, as a junior, she set a pair of U.S.
high-school records, breaking Mary Cain's 2013 mark in the indoor 3,000 meters (9:02.10) with a time of 9:00.16 and running 4:33.29 in the 1,600 meters to shave 0.53 seconds from Christine Babcock's 4:33.82, set in 2008.
Efraimson captured the bronze medal in the 1,500 meters at the 2013 World (U18) Youth Championships in Donetsk, Ukraine.