| Competition: | Cook Islands Round Cup |
| Season: | 2015 |
| Winners: | Tupapa Maraerenga |
| Continentalcup1: | 2016 OFC Champions League |
| Continentalcup1 Qualifiers: | Tupapa Maraerenga |
| Relegated: | None |
| Matches: | 42 |
| Total Goals: | 162 |
| Biggest Home Win: | Puaikura 10–0 Nikao Sokattak |
| Biggest Away Win: | Takuvaine 0–6 Tupapa Maraerenga |
| Highest Scoring: | Puaikura 10–0 Nikao Sokattak |
| Prevseason: | 2014 |
| Nextseason: | 2016 |
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.