Rolleston is the seat and largest town in the Selwyn District, in the Canterbury region of New Zealand's South Island. It is located on the Canterbury Plains 22 kilometres south-west of Christchurch, and is part of the wider Christchurch metropolitan area. Rolleston is one of the fastest growing towns in New Zealand, having grown from a population of around 2,800 in 2001 to around 28,000 in 2023.