Principal Medical Officer (PMO) is a senior position in the Royal Army Medical Corps, the Royal Canadian Navy, the Army Medical Corps (India), NHS Scotland and the Irish Health Service Executive.
James McGrigor was appointed Principal Medical Officer of the Portuguese Army during the Peninsular War.
[2] A position of Principal Medical Officer in the Crimea was established from 1854 to 1856 for the duration of the Crimean War.
[7] The St John Ambulance in England formerly had a Principal Medical Officer position.
[8] In Australia the position was the senior administrator of the Medical Department of each state from 1895, when it was created as part of the Colonial Secretary's Department, replacing the position of Colonial Surgeon, to 1911.