Papua New Guinea rugby league season
The 1991 Papua New Guinea Inter-City Cup (or for sponsorship reasons, the 1991 SP Cup), was the 2nd season of a nationwide rugby league tournament in Papua New Guinea. 
At the end of the rounds Port Moresby were on top becoming minor premiers. They also went on to defeat Mt Hagen Eagles in the grand final on tries scored after an 18–18 draw in regular time.
Teams.
This year as before 6 teams entered the competition. The Sika Kundiawa Warriors, Curtain Star Mendi Muruks, Collins &amp; Leahy Goroka Lahanis, Wamp-Nga Mt Hagen Eagles, Port Moresby Vipers and the LBC Lae City Bombers
Prize money.
"Man of the Match": Rounds 1-10 K100, Preliminary final K200, Grand Final K300 
"Minor Premiers": K3000
"Preliminary Final winners": K3000
"Preliminary Final losers": K1500
"Grand Final winners":K9000
"Grand Final loser": K3000
Total prize money: K20,000
Competition.
The league had 10 rounds after which teams in 2nd and 3rd played a preliminary final, the winners of which played the league leaders in the grand final. The competition started on 19 May. Games were played on Sundays.
Finals.
The prelim final was on 4 August, Mt Hagen beat Kundiawa 22-4 
The Grand final was on 11 August. The Pt Moresby Vipers and Mt Hagen drew 18-18 after regular time with the vipers winning by the fact of scoring more tries.
References.
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