Kittner was drafted in the 5th round of the 2002 NFL Draft by the Atlanta Falcons. He saw no action in his rookie year, being third-string quarterback behind Doug Johnson and 2001 first overall pick, Michael Vick. In 2003, after a preseason injury sidelined Vick and ineffective play caused second-string quarterback Doug Johnson to be benched, Kittner saw his first regular season action. Playing in seven games (four of which he started), he threw for 391 yards, scoring 2 touchdowns and throwing 6 interceptions. The highlight was a 27–7 win over the New York Giants at Giants Stadium where Kittner threw for a touchdown. The Falcons ended the season however with a 5–11 record.