K'inich Ahkal Mo' Naab' III (13 September 678 – c. 730) was a monarch of the Mayacity-state of Palenque. He took the throne on 3 January 722 and reigned at least into 729; his date of death is unknown.
Before his full Mayan language name was deciphered, he was referred to as Chaacal III.
Ahkal Mo' Naab' was born in 678 A.D., during the reign of his grandfather, Palenque's long-lived ruler K'inich Janaab' Pakal. Often referred to as "Pakal the Great", this ruler righted a kingdom that had been destabilized by enemy attacks and oversaw a building program that culminated in the Temple of the Inscriptions. His son K'inich Kan B'alam II constructed the magnificent temples of the Cross Group. Between them they left many inscriptions detailing Palenque history. Ahkal Mo' Naab' became king in 721.
His construction program rivaled that of his predecessors. In the newly discovered inscriptions of Temple XIX he contributed enormously to the surviving records of Palenque history. The buildings associated with Ahkal Mo' Naab' are Group IV, Temple XVIII, Temple XXI and Temple XVI.