John Child Hannyngton (23 September 1835, Barrackpore – March 1895, Lewisham) was a judge in the East India Company who served for many years as Resident of Travancore.
Born to Major General John Caulfield Hannyngton (1807–1885) and Harriet, he joined service in the East India Company in 1857 as a writer.
He visited Europe again on furlough for two years from 1876 and returned to be Acting Resident at Travancore and Cochin.
In 1883 he again went to Europe on furlough for 15 months and in 1884 returned to Travancore and Cochin to serve as Resident.
Hannyngton was the father of the Indian botanist E. K. Janaki Ammal's mother.