Dirty South Improv, or DSI, is a theater and production company based out of Chapel Hill, North Carolina. While focusing on improvisational comedy, DSI expanded in 2003 to include sketch comedy and other forms of comedy, and produces shows in Chicago and all throughout North Carolina.

In 2003, they opened a training center in Carrboro, North Carolina, and have now grown to become one of the largest comedy training centers in the United States. Each year, DSI hosts a 24-hour comedy marathon to benefit local charities, and a national comedy festival.