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. The Northern Ireland MP, Sir David Callender Campbell was one of his sons.