The Maadi Cup is the prize for the New Zealand Secondary Schools Boys' Under 18 Rowing Eights. More colloquially, it is the name given to the New Zealand Secondary Schools Rowing Regatta, at which the Maadi Cup is raced. The regatta is the largest school sports event in the Southern Hemisphere, with over 2,087 rowers from 113 secondary schools participating in 2023 The regatta is held annually in late March, alternating between the country's two main rowing venues: Lake Karapiro near Cambridge, and Lake Ruataniwha near Twizel.

Karapiro is a settlement and rural area in the Waipa District and Waikato region of New Zealand's North Island. It includes both the artificially created Lake Karapiro and the accompanying Karapiro Power Station. Karapiro is located just off State Highway 1, south-west of Cambridge.