McLennan Hills, Volcanic hills in Auckland, New Zealand.

McLennan Hills is a group of volcanic hills made up of several scoria mounds in Auckland, formed by the local volcanic field. The area now shows a mix of natural landforms and modern development, with homes and green spaces integrated into the terrain.

The hills formed through volcanic activity and were a significant area for Māori settlement before European colonization. Later, quarrying operations heavily altered the hills, which eventually became a residential neighborhood.

The Māori name Te Aponga o Tainui is recorded for the hills, and with neighbouring Ōtāhuhu/Mount Richmond they held fortified pā before European settlement, placed to command the route between the Waitematā Harbour/Tāmaki River and the Manukau Harbour. The scoria mounds themselves were later quarried away, so the pā sites survive as place names and memory rather than standing earthworks.

The scoria mounds were quarried away and the former quarry site was redeveloped for housing, so there is no summit or crater to walk to today. What remains is a residential neighbourhood; the hills can be picked out only from public streets and nearby high points such as Mt Richmond or Mt Wellington.

The hills' Māori name, Te Aponga o Tainui, refers to the crater of Tainui, linking the scoria mounds to the Tainui ancestral canoe. A 1940 aerial photograph, reproduced in Searle's geology of Auckland, records the crater group before quarrying removed it: one crater about 100 m wide, another about 50 m, and two or three smaller ones.