• Oldfield, Radulphus B., ?-1877 (1) - Commander of the "Lyra" and the "Ariel." Rendered assistance to the Zambezi Expedition on several occasions. Was the most successful prize-getter among the East African Squadron commanders.
  • Oswell, William C., 1818-1893 (81) - Explorer and hunter. Met Livingstone in South Africa in 1845, and travelled with him 1849-51. Remained close friends.
  • Owen, Richard, 1804-1892 (9) - Anatomist and naturalist. Conservator of the Hunterian Museum at the Royal College of Surgeons of England 1827-56. Professor of Comparative Anatomy and Physiology 1836-56. Taught Livingstone in 1840. Superintendent of the British Museum 1856-83. Knighted 1884.