Oliver Ormerod Walker (1833 – 30 May 1914) was a British Conservative Party politician. He was the eldest son of Oliver Ormerod Walker and his second wife, Helen Elizabeth Garston, of Chesham House, near Bury, Lancashire. He was a magistrate, justice of the peace and held a commission in the 7th Royal Lancashire Militia. He was also a Deputy-Lieutenant for Lancashire, Mayor of Bury and held the office of High Sheriff of Lancashire in 1876. On the formation of the Volunteer Force he became lieutenant colonel of the 8th Lancashire Rifle Volunteer Corps.