The 1991 Trans-Tasman Test series was an international rugby league test series played in Australia between Australia and New Zealand. The series, which started on 3 July in Melbourne and finished on 31 July in Brisbane, consisted of three test matches, with the third test doubling as a 1989–1992 Rugby League World Cup tournament match. New Zealand did not play in any other matches while on tour.
The test series was broadcast throughout Australia by the Seven Network with commentary provided by Pat Welsh, Roy Masters and Jon Harker. Paul Vautin provided sideline commentary during the first test in Melbourne but was replaced from the second test by Harker to allow Wally Lewis to join the team following his omission from the Australian test team. Also doing sideline reporting during the series was John Brady. The series was broadcast in New Zealand by TV3 with commentary provided by Australia's Graeme Hughes and former New Zealand and then-Manly-Warringah coach Graham Lowe.