Ambassador Oluyemi AdenijiListenⓘ (22 July 1934 – 27 November 2017 in London)[1] 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.

He served in the Ministry of Foreign Affairs and Nigerian embassies in Washington, D.C., Freetown, Sierra Leone, and Accra, Ghana.

The mission was responsible for providing security in Bangui and for coordinating the legislative and presidential elections held in 1998 and 1999.

He was then appointed the United Nations Secretary General's Special Representative for Sierra Leone and Head of the United Nations Mission in Sierra Leone (UNAMSIL).

[3] In addition, he served on the Commission of Eminent Persons on The Role of the IAEA to 2020 and Beyond, chaired by Ernesto Zedillo, whose report Reinforcing the Global Nuclear Order for Peace and Prosperity was launched in June 2008.