Huapai is a locality north-west of Auckland, New Zealand. State Highway 16 and the North Auckland Railway Line pass through it. Kumeu is adjacent to the east, Riverhead is to the north-east, and Waimauku to the west.
The locality is part of the Kumeu wine growing district, with grapes first planted at Huapai by Nikola Nobilo in 1943.
Huapai District School is a coeducational full primary school (years 1-8), with a decile rating of 9 and a roll of 436 in 2013.