Henare Kaihau (1854/1860? – 20 May 1920) was a New Zealand Māori politician, serving as Member of the House of Representatives for the Western Maori electorate.

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His birth year is uncertain. The Dictionary of New Zealand Biography gives a range from 1854 to 1860,^[1] whereas Wilson gives 1855.^[2]

He unsuccessfully contested the Western Maori electorate in the 1884 election. Of eight candidates, he came fifth with 9.7% of the vote.^[3] In the 1886 by-election, he came third out of five candidates.^[4][5] In the 1896 election, he defeated Ropata Te Ao,^[6] and he held the Western Maori electorate to 1911 when he was defeated by Māui Pōmare.^[2]

Wilson notes him as a Reform Party supporter.^[2] Kaihau does, however, appear on a poster of the Liberal Party in 1910.^[7] The New Zealand Herald, in its 1905 election reporting, also lists him as a government supporter, i.e. a Liberal.^[8] Those newspapers that listed political affiliation for Maori candidates for the 1908 election, The Star (Christchurch) and The Tuapeka Times, also show him as a supporter of the Ward Ministry.^[9][10]