Gareth 'Gai' J Thomas 'Toms' (born 14 September 1976 in Bangor, Wales) is a Welsh singer-songwriter, musician, producer and actor.

From 1997 to 2007 he created an 'off the road' Welsh folk outfit Mim Twm Llai, releasing three albums on Recordiau Sain.

Since 2008, he dropped the Mim Twm Llai pseudonym for his own lifelong nickname Gai Toms, performing solo on guitar or with his backing band.

Music styles vary from folk revival to indie rock, depending on album concepts and themes.

Due to massive cuts in royalties for Welsh artists, he participated in the show/competition several times under different guises.