The 1999 Super 12 season was the fourth season of the Super 12, contested by teams from Australia, New Zealand and South Africa. The season ran from February to May 1999, with each team playing all the others once. At the end of the regular season, the top four teams entered the playoff semi finals, with the first placed team playing the fourth and the second placed team playing the third. The winner of each semi final qualified for the final, which was contested by the Canterbury Crusaders and the Otago Highlanders at Carisbrook, Dunedin. The Crusaders won 24 – 19 to win their second Super 12 title.