Stag Owners Club of UK (dedictaed to Triumph Stag owners) Excellent forum.
UK: The TR register caters to all Triumph TRs from TR2 to TR8
World: Triumph car club with no specific country focus
UK: Triumph car club covering all Triumph cars (don't let the name think its only 6 cyclinder cars)
UK: Triumph car club covering all Triumph cars
NZ (Christchurch): Triumph car club based in Christchurch covering all Triumph cars
Triumph Owners Club Christchurch
NZ (Wellington): Triumph car club based in Wellington covering all Triumph cars
Wellington Triumph Sports Car Club
NZ (Auckland): Triumph car club based in Auckland covering all Triumph cars
USA: Triumph car club in USA
USA: Buckeye Triumph is based in USA, lots of great detailed technical articles