"We are fired up to have Dirk join our staff as our offensive coordinator," Falcons head coach Dan Quinn said in a statement. "His experience and familiarity with our division will also pay dividends as we move forward."
Mike Mularkey, who parted ways after going 20-21 in parts of three seasons as head coach of the Tennessee Titans, was named the Falcons' tight ends coach on Tuesday. Mularkey also previously served as offensive coordinator in Atlanta.
Koetter, who turns 60 next month, previously was the Falcons' offensive coordinator from 2012 to 2014. He helped the Falcons to the NFC Championship Game in 2012 as the offense averaged 26.2 points per game and 369.1 yards per game. During his first three-year stint in Atlanta, the Falcons averaged 363.5 yards per game, 277.2 passing yards per game, and 24.0 points per game.