The third season of America's Got Talent is a popular American television reality show talent competition that premiered on NBC on June 17, 2008. The show offers a platform for people with unique talents from all over the United States to showcase their skills and compete for a grand prize of $1 million.

Before the show's debut, preliminary auditions were held in various cities across the country, including New York, Dallas, Los Angeles, Atlanta, Chicago, and MySpace. The judges for the third season included Sharon Osbourne, Piers Morgan, and David Hasselhoff, while Jerry Springer returned as the host.

After its successful premiere in the US, the show was broadcasted live in the United Kingdom on ITV2 seven months later. It made its debut in Singapore on Channel 5 in September 2008 and on Hong Kong TVB Pearl on May 23, 2009.

One notable change in this season's format was the introduction of new stages and judges' tables with "X" designs, matching those used in Britain's Got Talent or borrowed for the season. The third season began broadcasting live on August 26, 2008, following a three-week hiatus for the 2008 Summer Olympics.