Alexi Pappas or Alexia Pappa (Greek Αλεξία Παππά; born 28 March 1990) is a Greek-American long distance athlete, filmmaker, actor, and writer. As a long distance runner, Alexi has been most successful in the 10km, but has also been a National Collegiate Athletic Association (NCAA) All-American at indoor 3,000 metres, 5,000 metres, and the steeplechase as well as the Ivy League champion in the steeplechase. In the 2016 Summer Olympics Women's 10km, Pappas represented Greece and set a national Greek record. As a filmmaker, Alexi co-wrote and starred in Tracktown.
Pappas was born in San Francisco on 28 March 1990, to a Greek-American father who has roots from Rhodes and an American mother, and grew up in Alameda, California. Her mother died when Alexi was four years old. She has a brother who is 4 years older.
As a sophomore at Oakland's Bishop O'Dowd High School, Alexi placed fourth in the Division III girl's race at the California Interscholastic Federation State Cross Country Championships on 26 November 2005. She covered the 5K course in 18 minutes, 19 seconds leading the girls' team to place 13th at the 2005 CIF D3 State meet. She was a soccer midfielder at Bishop O'Dowd '08, where she went by the name Lexi Pappas.