The 2015 Cook Islands Round Cup is the forty-second recorded season of top flight association football competition in the Cook Islands, with any results between 1951 and 1969, and also in 1986 and 1988–1990 currently unknown.
[1] Tupapa Maraerenga won the title by four points from second place finishers Titikaveka.
This was Tupapa's second title in a row and the fifth time they had won the Round Cup in the last six seasons.