Upokongaro (more correctly, Ūpokongaro) is a settlement 12 kilometres (7.5 mi) upriver from Whanganui, New Zealand, in the Makirikiri Valley. Settled by Europeans in the 1860s, it was an important ferry crossing and riverboat stop. A spectacular discovery of moa bones was made in the area in the 1930s.
The village's name in Māori, ūpoko (head) ngaro (hidden), refers to a story of how chief's daughter Ira-nga-rangi arranged to have her head removed upon her death and hidden by relatives, who feared it might be desecrated by enemies. Supposedly the preserved head was hidden in a cave on the banks of the Ūpokongaro Stream north of the settlement, from which the village takes its name.
At the time of European contact, both Ūpokongaro and adjacent settlements Waipakura and Kukuta were home to the Ngāti Patutokotoko hapū of the iwi Te Āti Haunui-a-Pāpārangi. Ngāti Iringirangi and Nga Paerangi are also noted as being present. The fortified hilltop pā at Ūpokongaro was called Opiu; during the tense times of the 1840s, Opiu was pulled down and abandoned.
Waipakura, south of Ūpokongaro, was one of a number of native reserves set aside in the 1848 Deed of Sale; some of it was leased to settlers in the 1860s. Ūpokongaro was described as a "small pā" in 1865, and Māori settlement persisted until at least the 1880s. The pā site at Opiu was used as a refuge for settlers' wives and children in 1862, when there were fears of Hau Hau war parties, and was later turned into a redoubt.
In 1866, settler John Kennedy built a hotel and a store (later the post office); during the 1870s and '80s, the local name for Ūpokongaro was "Kennedy's". A school was built in 1870, known from 1873–1879 as the North Makirikiri or "River Bank" school.
The schoolroom functioned for Anglican services in the mid 1870s, but in 1877 St Mary's Anglican Church was built. Designed by local architect Edward Morgan and built by John Randal, St Mary's is distinctive in having a spire with a triangular cross-section, on a four-sided steeple. Its stained glass window was installed in 1879, in memory of Archibald Montgomery, a young Upokongaro man lost in the sinking of the clipper Avalanche in the English Channel just before the church was completed. St Mary's is the oldest church in the Whanganui District on its original site.