Sir John Reeves Ellerman, 1st Baronet, CH (15 May 1862 – 16 July 1933) was an English shipowner and investor, believed to be the richest man in England. An accountant by training, he learned to identify underpriced companies and acquired them, often as sole stakeholder. His shipping interests were combined into the giant Ellerman Lines, and he also invested in newspapers, breweries, coal and prestige London property. Despite his huge wealth, his personal life was notably modest and private.