Gareth Thomas

• Gareth Thomas (actor), Welsh actor
• Gareth Thomas (Welsh politician), former member of parliament for the Clwyd West constituency
• Gareth Thomas (English politician), member of parliament for Harrow West
• Gareth Thomas (rugby, born 1974), Welsh rugby union and rugby league footballer
• Gareth Thomas (rugby union, born 1993), Welsh rugby union footballer for the Ospreys