达戈贝尔特三世（法语：Dagobert III，699年－715年9月3日），法兰克王国墨洛温王朝国王（711年4月23日－715年9月3日在位）。

达戈贝尔特是希尔德贝尔特三世的儿子，继承了父亲三个法兰克王国——纽斯特里亚、勃艮第及奥斯特拉西亚的领土。在宫相丕平二世死后，丕平二世的继承人公开与他发生冲突。

Dagobert III (699–715) was Merovingian king of the Franks (711–715).

He was a son of Childebert III. He succeeded his father as the head of the three Frankish kingdoms—Neustria and Austrasia, unified since Pippin's victory at Tertry in 687, and the Kingdom of Burgundy—in 711, at the age of twelve. Real power, however, still remained with the Mayor of the Palace, Pippin of Herstal, who died in 714. Pippin's death occasioned open conflict between his heirs and the Neustrian nobles who elected the mayors of the palace. As for Dagobert himself, the Liber Historiae Francorum reports he died of illness, but otherwise says nothing about his character or actions.