Waipatia is an extinct genus of odontocetes from the late Oligocene (Chattian) of New Zealand.
The type species, Waipatia maerewhenua is known from a single skull found near 45ð South in Otago. The second species, W. hectori, was originally named Microcetus hectori in 1935, but later recognized as distinct from Microcetus. "Uncamentodon" was informally coined for M. hectori in a table by Rothausen in a 1970 paper, but the lack of a diagnosis or description made it a nomen nudum. Finally in 2015, M. hectori was recognized as a second species of Waipatia based on preparation of additional material included in the holotype.