Sir Henry Campbell (1856 – March 6, 1924) was an Irish nationalist politician. He was Member of Parliament (MP) for South Fermanagh from 1885 to 1892, private secretary to the Irish leader Charles Stewart Parnell from 1880 to 1891, and from 1893 to 1920. Knighted by the British government in January 1921, he was known as “Sir Henry Campbell” only in retirement.