Alex Yi (born March 21, 1982 in Alexandria, Virginia) is an American soccer defender, who currently plays for F.C. Dallas of Major League Soccer.

As a teenager, Yi was a member of Under-17 national team, and as such was part of the inaugural class of the USSF's Bradenton Academy, along with other players such as Landon Donovan, DaMarcus Beasley, and Oguchi Onyewu . Upon graduating, he matriculated to UCLA, where he played college soccer in 2000 and 2001, where he started in 41 games and was named a third team All-American as a sophomore.

Following his sophomore year Yi left UCLA to pursue a professional career in Europe; he signed with Royal Antwerp of the Belgian Jupiler League, a feeder club of Manchester United, before the start of the 2002-3 season. Yi disappointingly only appeared in four matches for Antwerp in the 2002-3 season, and, after appearing in only seven for the struggling club in the subsequent season, was released from his contract to pursue opportunities in America.

Yi was coveted by several teams upon his return to the United States, most notably his hometown D.C. United, but was eventually allocated to F.C. Dallas through a weighted lottery on January 12, 2005.

Yi has played for the U-17, U-20, and U-23 United States youth national teams, and played in the 1999 Football World Youth Championship. His father, Kyom Yi, played for the South Korean national team at the youth level.