The Marine Society is a British charity, the world's first established for seafarers. In 1756, at the beginning of the Seven Years' War against France, Austria, and Saxony (and subsequently the Mughal Empire, Spain, Russia and Sweden) Britain urgently needed to recruit men for the navy. Jonas Hanway (1712–1786), who had already made his mark as a traveller, Russia Company merchant, writer and philanthropist, must take the chief credit for founding the society which both contributed to the solution of that particular problem, and has continued for the next two and a half centuries to assist many thousands of young people in preparing for a career at sea.
In 2004, in a merger with the Sea Cadet Association, the Marine Society & Sea Cadets was formed.