William Ockleford Oldman (24 August 1879 – 30 June 1949) was a British collector and dealer of ethnographic art and European arms and armour. His business W.O. Oldman, Ethnographical Specimens, London was mostly active between the late 1890s and 1913. Ethnographic specimens with a provenance to Oldman's business can be found in various public institutions around the world including the National Museum of the American Indian, Pitt Rivers Museum, the British Museum and others. Items were either collected directly from Oldman or were part of donations from other significant collectors.