Thommo Reachea IV (Khmer: ព្រះបាទសម្តេចធម្មោរាជា ទី៤) (1706–1747), born Ang Em, was a Cambodian king during Post-Angkor Period (r.
[1] Thommo Reachea IV was a son of Thommo Reachea III.
He ascended the throne after his father's death in 1747.
He struggled for power with his brother Ang Hing and brother-in-law Ang Tong.
In the same year he was murdered by Ang Hing; then Ang Hing was murdered by Ang Tong.