The 2015 Women's Twenty20 Cup, known for sponsorship reasons as the 2015 NatWest Women's Twenty20 Cup, was the 7th cricket Women's Twenty20 Cup tournament. It took place between June and August, with 38 teams taking part: 34 county teams, alongside Scotland, Ireland, Wales and Netherlands. Sussex Women won the Twenty20 Cup, achieving their second title. The tournament ran alongside the 50-over 2015 Women's County Championship.