Arnold William Reinold CB FRS (19 June 1843 – 11 April 1921) was an English physicist.
Born in Hull, the son of shipbroker John Henry Arnold Reinold, he received his early education at the St Peter's School, York.
He became a fellow of Merton College, Oxford in December, 1866;[2] a position which he resigned in 1869[1] upon marrying Marian Studdy Owen[3]—the couple had one daughter and three sons.
[1] When the Royal Naval College, Greenwich was established in 1873, he was appointed Professor of Physics there; a post he held for the next 35 years.
Between 1877–93, he collaborated with English physicist Arthur William Rucker on series of papers about the properties of thin films.