Henry Jackson OM FBA (12 March 1839 – 25 September 1921) was an English classicist. He served as the vice-master of Trinity College, Cambridge from 1914 to 1919, praelector in ancient philosophy from 1875 to 1906 and Regius Professor of Greek (Cambridge) at the University of Cambridge from 1906 to 1921. He was elected a Fellow of the British Academy in 1903. He was awarded the Order of Merit on 26 June 1908. From 1882 to 1892 he sat on the Council of the Senate of the University of Cambridge, and was an active member of a number of the university boards. He lived within the walls of Trinity College for over 50 years. Born in Sheffield, he lived mainly in Cambridge, but died in Bournemouth.