Reameathiptei III (Khmer: ព្រះបាទរាមាធិបតីទី៣) (1692–1757), born Ang Tong (Khmer: អង្គទង pronounced [ʔɑŋ.tɔːŋ]), was a Cambodian king (r. 1747–1749, 1756–1757).
Ang Tong was a son-in-law of Thommo Reachea III. He struggled for power with Thommo Reachea IV and Ang Hing. Later he killed Ang Hing and ascended the throne. In 1749, the Vietnamese army invaded Cambodia and installed Satha II. Ang Tong fled to the Ayutthaya Kingdom.
Ang Tong was restored as king after Chey Chettha V's death. He died in Pursat in 1757. This time he was succeeded by his grandson Outey II.
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