John Henry Dallmeyer (6 September 1830 – 30 December 1883), Anglo-German optician, was born at , Westphalia, the son of a landowner. On leaving school at the age of sixteen he was apprenticed to an Osnabrück optician, and in 1851 he came to London, where he obtained work with an optician, W Hewitt, who shortly afterwards, with his workmen, entered the employment of Andrew Ross, a lens and telescope manufacturer. His second son, Thomas Rudolphus Dallmeyer assumed control of the business on the failure of his father's health.