Sir Stephen Bartlett Lakeman, also known as Mazar Paşa or Mozhar Pasha (1823 – July 1897) was an English-born British and Ottoman adventurer, soldier, and administrator. A mercenary and veteran of several wars, including the Xhosa and Crimean conflicts, he was assigned by the Ottoman military to Wallachia, where he later settled, becoming in time a supporter of the liberal current in Romania. He was an influential figure in local politics during the early 1870s, and a mediator between Ion Brătianu's government and the Porte at the start of the Russo-Turkish War of 1877–1878. Lakeman is also noted for having introduced Eastern European fish species to England.