Dawson edged out Langer, twice U.S. Masters champion, and Briton Colin Montgomerie in the final round to claim his first title in his fourth European senior Tour appearance.
The 52-year-old Montgomerie, who won his second senior U.S. PGA title in May and lifted last year's senior U.S. Open, led by two strokes after nine holes of his final round but was overtaken by Dawson who finished on 16 under par.
Langer, 57, carded a 15-under aggregate total with Briton Montgomerie a further two strokes back.
Dawson, 51, holed a brilliant 20-foot birdie putt on the final green to clinch the trophy ahead of Langer who also carded a closing 64.
The American never won a U.S. regular PGA Tour event, his best finish being second place behind Scott Hoch at the 1995 Greater Milwaukee Open.
(Reporting by Ed Osmond; editing by Justin Palmer)
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