Sir Henry Alexander Miers, FRS (25 May 1858 – 10 December 1942) was a British mineralogist and crystallographer. Born in Rio de Janeiro, Brazil, he was educated at Eton College and Trinity College, Oxford. He was elected a Fellow of the Royal Society in 1896. He was Professor of Crystallography at the Victoria University of Manchester 1915-1926 and Vice-Chancellor of the University during the same years.