TJ's was a nightclub located on Clarence Place in Newport, South Wales. It opened in 1985 and became a live music venue, particularly for rock music. It was an integral part of the so-called toilet circuit. The club advertised itself as "The Legendary TJ's".
John Sicolo started the venue with his then wife Vivienne in 1971 as a restaurant named "Cedar's Rest" before becoming a burger bar named "The Pittsburg Diner". Sicolo bought the premises in 1973 and extended into an adjoining property to form the nightclub "El Sieco's", during which time a variety of musical artists, including local folk acts, performed at the premises.
Sicolo established TJ's as a live music venue on the premises in 1985, the name TJ's representing John and his late partner Trilby Tucker.
Catatonia filmed their single "Mulder and Scully" at the venue. It is allegedly the place that Kurt Cobain proposed to Courtney Love. Other bands which played at T.J's early in their careers include Oasis, Manic Street Preachers, Green Day, The Offspring, Lostprophets, Iron Maiden, The Stone Roses, Muse, Primal Scream, Descendents, Nofx, Misfits, Mighty Mighty Bosstones, Lagwagon, The Bouncing Souls, The Vandals, The Ataris, and Skunk Anansie.