Old Croghan Man is a well-preserved Irish Iron Age bog body found in June 2003. The remains are named after Croghan Hill, north of Daingean, County Offaly, near where the body was found. The find is on display in the National Museum of Ireland in Dublin.

A bog body is a human cadaver that has been naturally mummified in a peat bog. Such bodies, sometimes known as bog people, are both geographically and chronologically widespread, having been dated to between 8000 BCE and the Second World War. The unifying factor of the bog bodies is that they have been found in peat and are partially preserved; however, the actual levels of preservation vary widely from perfectly preserved to mere skeletons.