Henry Ellis Daniels FRS (2 October 1912 – 16 April 2000) was a British statistician. He was President of the Royal Statistical Society (1974–1975), and was awarded its Guy Medal in Gold in 1984, following a Silver medal in 1947. He became a Fellow of the Royal Society of London in 1980. The Parry-Daniels map is named after him (together with the English mathematician Bill Parry).
His family was Jewish, of Russian (partly Polish and partly Lithuanian) origin.
Henry graduated from the University of Edinburgh and went on to study at Clare College of the University of Cambridge. In 1957, he became the first Professor of Mathematical Statistics at the University of Birmingham. He stayed at the university till his retirement in 1978. After retirement, he went to Cambridge and lived there until his death.
The watchmaker George Daniels (no relation) enlisted Daniels' help with the equations required for the design of his Space Traveller's Watch.