Harry Warner Farnall (18 December 1838 – 5 June 1891) was a New Zealand politician, emigration agent and labour reformer. He was a Member of Parliament from Auckland.
He was born in Burley Park, Hampshire, England on 18 December 1838.
He represented the Northern Division electorate from 1869 to 1870, and then the Rodney electorate from 1871 to 1872, when he resigned. He contested the 1890 election in the City of Auckland electorate. Of seven candidates, he came last.