Arlington Louis "Ali" Highsmith (born January 20, 1985) is an American former professional football player who was a linebacker for the Arizona Cardinals of the National Football League (NFL).

He played college football for the LSU Tigers, earning first-team All-American honors in 2007.

In 2008, Highsmith made the team out of training camp and went on to appear in six games for the Cardinals as a rookie before being placed on season-ending injured reserve with a knee injury on November 4.

Highsmith was waived by the Cardinals on December 22, 2009, and re-signed to the team's practice squad the following day.

Highsmith was claimed off waivers by the San Diego Chargers on August 5, 2010.