The 2018 Mitre 10 Cup season was the thirteenth season of New Zealand's provincial rugby union competition since it turned professional in 2006. The regular season began on August 16, when North Harbour hosted Northland. It involved the top fourteen rugby unions of New Zealand. For sponsorship reasons, the competition was known as the Mitre 10 Cup and it was the third season under the lead sponsor. The winner of the Championship, Waikato was promoted to the Premiership, the seventh placed Premiership team, Taranaki was relegated to the Championship.