Ambassador Oluyemi Adeniji (22 July 1934 – 27 November 2017 in London) was a Nigerian career diplomat and politician who was the Special Representative of the General Secretary with the United Nations Mission in Sierra Leone (UNAMSIL) from November 19, 1999 to July 16, 2003. Later he was Foreign Minister of Nigeria from July 2003 to June 2006, then Internal Affairs Minister from 21 June 2006 to May 2007.