- Language: Iduh
- Alternate names: O Du, O'du, 'Iduh, Hat, Haat, Tay Hat
- Language code: tyh
- Language family: Austro-Asiatic, Mon-Khmer, Northern Mon-Khmer, Khmuic, Mal-Khmu’, Khmu’ (SIL classification)
- Number of speakers: ~30
- Vulnerability: Endangered
Official ethnic community. Call themselves O Du. Traditional religion.
Believed to be an eastern dialect of Khmu until recent fieldwork by Gerard Diffloth.