Roto-o-Rangi or Rotoorangi is a rural community in the Waipa District and Waikato region of New Zealand's North Island, located south of Cambridge and north-east of Te Awamutu.

[3] The rest of Roto-o-Rangi is sparely populated with a small number of homes and businesses, including a furniture shop run out of a converted dairy farm barnhouse.

A fortification was built to accommodate 60 men on the main road between Cambridge and Te Awamutu.

A Cambridge-based teacher and post-master opened a school in the settlement two years later, in February 1905, sending children home once a week with letters from their parents.

[5] The Roto-o-Rangi Memorial Hall was opened on 8 September 1938, following a fundraising campaign by the local community.

Dances were held at the hall through the decades, with women usually outnumbering men.

[7] Roto O Rangi Road has recently been the site of fatal crashes.

[8] Roto-o-Rangi locality is in two SA1 statistical areas which cover 35.24 km2 (13.61 sq mi).

Before the 2023 census, the statistical area had a smaller boundary, covering 182.15 km2 (70.33 sq mi).