Westfield Junction is a railway switching junction on the Auckland railway network in New Zealand. It is 1.9 kilometres (1.2 mi) north of Otahuhu station and is surrounded by the industrial area of Westfield. Westfield Junction defines the southernmost extremity of the North Auckland Line (NAL) via Penrose and the point where the North Island Main Trunk (NIMT) line via Glen Innes intersects with the NAL. The NIMT continues south from Westfield Junction toward Otahuhu and Papakura. Westfield station, a few hundred metres south of Westfield Junction, was closed in March 2017.