William Howard Campbell (20 September 1859 - 18 February 1910) was an Irish Presbyterian missionary who worked with the London Missionary Society in southern India. He worked in Jammalamadugu in Cudappah District. He was also a naturalist with a keen interest in birds and moths. The Campbell Memorial School founded in Jammalamadugu in 1913 was named in his memory.[1] The Northern Ireland MP, Sir David Callender Campbell was one of his sons.