Robert Julian Yeatman (15 July 1897 – 13 July 1968) was a British humorist who wrote for Punch. He is best known for the book 1066 and All That, a tongue-in-cheek guide to "all the history you can remember", which he wrote with W. C. Sellar in 1930.
Yeatman was born in Chelsea, London. He spent some of his early years in Porto, the principal city and port of northern Portugal, where his father worked as a port wine merchant, a family business connected with Taylor's Port. From 1911 he was educated at Marlborough College. In World War I he was commissioned into the Royal Field Artillery. Serving in France, he won the Military Cross and was severely wounded. After the war he attended Oriel College, Oxford, where he met Sellar. Yeatman then worked as a journalist before becoming advertising manager for Kodak Ltd.
With ambitions to be a writer, Yeatman contributed humorous pieces to Punch from 1926, which was an immediate success. Three further joint ventures with Sellar followed: And Now All This (1932), Horse Nonsense (1933), and Garden Rubbish (1936), all selling well but without the popular success of 1066.