Waharoa is a genus of eomysticetid baleen whale from the Late Oligocene (Chattian) of New Zealand.

It was identified with the discovery of Waharoa ruwhenua by Boessenecker and Fordyce (2015), which added a new genus and species to a monophyletic family Eomysticetidae.

[1] This intermediate flexibility suggests that W. ruwhenua harbored the most primitive form of a kinetic rostrum in the Mysticeti.

[1] The posterior localization of baleen along with a delicate temporomandibular joint with a probable synovial capsule, an anteroposteriorly expanding palate, a non-laterally deflected coronoid process, and a shortage of characteristics indicative of lunge feeding indicate that W. ruwhenua could have utilized skim filter-feeding like modern Balaenidae to feed for zooplankton.

Waharoa shared its habitat with the odontocetes Awamokoa, Austrosqualodon, Otekaikea, and Waipatia, and the mysticetes Horopeta, Matapanui, Mauicetus, Tohoraata, Tokarahia, and Whakakai.