Nangklao (Rama III) (full royal name Phra Nang Klao Chaoyuhua) (March 31, 1788 - April 2, 1851) third of the Chakri dynasty, was king of Thailand from 1824 to 1851.

He ordered the destruction of Vientiane in 1827-1828.

After his death his brother Mongkut became his successor.