Trebanos (Welsh: Trebannws) is a village in the Swansea Valley, Wales.

But in the Welsh-language dialect of the area, there is a tendency to pronounce the final vowel as an 'o'.

Notable people from Trebanos include rugby union players Bleddyn Bowen, who captained Wales to the 1988 Triple Crown, Robert Jones, who was capped for Wales 54 times and helped win the 1988 Triple Crown, fly-half Arwel Thomas who was capped for Wales 23 times and openside flanker Justin Tipuric.

Greg Thomas, a first-class cricketer and fast bowler was born in Trebanos.

[1] Actress Harriet Lewis who played Maggie Post in the Welsh soap opera Pobl Y Cwm was born and lived in Trebanos all her life.