Edward Hamilton Aitken (16 August 1851, Satara, India – 11 April 1909, Edinburgh) was a civil servant in India, better known for his humorist writings on natural history in India and as a founding member of the Bombay Natural History Society. He was well known to Anglo-Indians by the pen-name of Eha.
Eha was born at Satara in the Bombay Presidency on August 16, 1851. His father was the Rev. James Aitken, missionary of the Free Church of Scotland. His mother was a sister of the Rev. Daniel Edward, a missionary to the Jews at Breslau for some fifty years. He was educated by his father in India. His higher education was obtained at Bombay and Pune. He passed M.A. and B.A. of Bombay University, first on the list, and won the Homejee Cursetjee prize with a poem in 1880. From 1870 to 1876, he taught Latin at the Deccan College in Pune. He also knew Greek and was known to be able to read the Greek Testament without the aid of a dictionary. He grew up in India, and it was only later in life that he visited England for the first time, and he found the weather of Edinburgh severe.
He entered the Customs and Salt Department of the Government of Bombay in April 1876, and served in Kharaghoda (referred to as Dustypore in The Tribes on my Frontier), Uran, Uttara Kannada and Goa Frontier, Ratnagiri, and Bombay itself. In May, 1903, he was appointed Chief Collector of Customs and Salt Revenue at Karachi, and in November, 1905, was made Superintendent in charge of the District Gazetteer of Sind. He retired from the service in August 1906.