I, Claudius is a historical novel by English writer Robert Graves, published in 1934. Written in the form of an autobiography of the Roman Emperor Claudius, it tells the history of the Julio-Claudian dynasty and the early years of the Roman Empire, from Julius Caesar's assassination in 44 BC to Caligula's assassination in AD 41. Though the narrative is largely fictionalized, most of the events depicted are drawn from historical accounts of the same time period by the Roman historians Suetonius and Tacitus.

Captain Robert von Ranke Graves was an English poet, soldier, historical novelist and critic. His father was Alfred Perceval Graves, a celebrated Irish poet and figure in the Gaelic revival; they were both Celticists and students of Irish mythology.