James Stack (1 September 1801 – 18 April 1883) was a Wesleyan Methodist missionary at Kaeo, New Zealand in the 19th century. He later became an Anglican missionary and a member of the Church Missionary Society (CMS). In 1837 he experienced the Wesleydale Methodist Mission being ransacked by warriors of the Ngāpuhi iwi (tribe). In the late 1830s he worked with other CMS missionaries in Te Papa Mission at Tauranga, after a war party lead by Te Waharoa, the leader of the Ngāti Hauā, attacked neighbouring tribes in Rotorua and Tauranga. He later worked with William Williams in the mission to the Māori of the Gisborne District.