Ōtaki (previously Otaki) is a New Zealand Parliamentary electorate, spanning part of the coast of the lower North Island. The bulk of its population comes from the Horowhenua District, but it also takes in part of the northern Kapiti Coast, including the towns of Otaki and Waikanae, and part of Paraparaumu. The current MP for Ōtaki is Nathan Guy of the National Party. He has held this position since 2008 election.
In the 1892 electoral redistribution, population shift to the North Island required the transfer of one seat from the South Island to the north. The resulting ripple effect saw every electorate established in 1890 have its boundaries altered, and eight electorates were established for the first time, including Otaki.
Otaki was created for the 1893 election, and the first member for Otaki was James Wilson, who held the seat until 1896. For most of the early 1900s the seat was won by William Hughes Field, a Liberal-turn-independent-turn-Reform. He lost it to John Robertson of the Social Democratic Party (who had been nominated by the flax-workers union) in 1911, but won it back in 1914.