Alexa Efraimson (born February 20, 1997) is an American former professional middle distance runner from Camas, Washington who competed for Nike.

[8][9] On February 1, high school junior Alexa Efraimson ran 9:00.16 to finish 4th in the 3,000m at the 2014 University of Washington Invitational, breaking Mary Cain's 9:02.10 United States high school national records in track and field which Mary ran on the same track one year earlier.

At the Washington State High School track and field meet, Alexa continued her record-breaking ways, winning the 800 metres in 2:04.10 (Breaking the state meet record) and won the 1600m, setting a national high school record times for the 1600 metres in 4:33.29.

[11] 2014 Diamond League Alexa raced against professionals at New York City Adidas Grand Prix in the 1500 meters on June 14, 2014, and finished 10th running a Personal Best time of 4:07.05.

[19] 16:09.44 PAYTON JORDAN May 2, 2015[20][21] 4:09.43 Walnut (Hilmer Lodge), CA April 17, 2015[22][23] 2:01.13 Portland, OR May 17, 2015 4:03.39 1500m PRE Classic May 30, 2015 (New American High School[broken anchor] & Junior Record) Alexa Efraimson competed well setting lifetime personal best in the following events.

[30] Camas Mayor Scott Higgins on Monday night, following his proclamation that Friday, August 8, would be "Alexa Efraimson Appreciation Day".

Alexa's mother, Chantel (born 1976), was a member of the swim team and an Oregon State University graduate.