Llewellyn "Llew" Treharne (birth unknown – death unknown) was a Welsh rugby union and professional rugby league footballer who played in the 1900s. He played club level rugby union (RU) for Penygraig RFC, and representative level rugby league (RL) for Wales, and at club level for Wigan, as a wing, or centre, i.e. number 2 or 5, or, 3 or 4.