The à Âhikaiti River is a river of the West Coast Region of New Zealand's South Island. It flows north from Mount Galileo, in the Paparoa Range, paralleling the course of the larger à Âhikanui River which lies two kilometres to the west. The à Âhikaiti empties into the Buller River at the Buller Gorge, 15 kilometres southwest of Westport.
The New Zealand Ministry for Culture and Heritage gives a translation of "place of small incantations" for à Âhikaiti.
à Âhikaiti River has been the official name of the river since it was gazetted on 21 June 2019. The explanation is given that 'o' means place of, 'hika' is a ritual and 'iti' and 'nui' are small and large. The ritual was for a chief, Te Pà «oho-o-te-rangi, who died during a raid.
The river generally follows the à Âhikaiti Fault, which probably formed about 35 million years ago.
A totara bridge over the Little Ohika was built in 1877, but damaged by a flood on 4 November 1877. It was replaced in 1889 by a bridge over the Ohika-iti, with four spans of and one of . The 1938 concrete bridge has two spans of and two of . SH6 now crosses the river near its mouth.