Henry James Greenslade (28 August 1866 – 18 April 1945) was a Liberal Party Member of Parliament in New Zealand.

Greenslade was born in Auckland, but came to Thames, where he grew up, with his parents when he was less than two years old.

[2] He resigned from the mayoralty in March 1900, as he had bought a farm in Ōhaupō in the Waipa District.

[4][5][6] He won the Waikato electorate in the 1905 general election, and held it to 1911, when he was defeated by the Reform candidate Alexander Young.

[7] In 1935, Greenslade was awarded the King George V Silver Jubilee Medal.