Miladin Milošević was born in 1949 in Gacko, where he completed his primary and secondary education. He graduated history from the Belgrade University’s School of Philosophy. He started working at the Belgrade History Archives in 1978. Between January and June 1978, he attended and completed an expert course in archival organization at the Archives of Serbia in Belgrade. In January 1980 he started working at the Yugoslav Archives as an expert associate, in charge of providing professional supervision and protection of archival holdings outside the archives. In February 1982 he was appointed head of the Department for the Admission and Protection of Archival Holdings at the Archives as an advisor. He became an independent advisor in 1986. He became head of department at the Yugoslav Archives in 1992. In November 1995, under a decision of the Federal Prime Minister, he was appointed assistant director of the Sector for Archival Affairs. Under a decision of the Federal Prime Minister of January 2001, he was appointed deputy director and under a decision of the President of the Council of Ministers of December 2003, he was appointed assistant director of the Sector for the Protection, Information and Use of Archival Holdings. Under a decision of the Serbian Government of November 16, 2006, he was appointed acting director of the Archives of Serbia and Montenegro.

He worked on the protection of archival and registry holdings outside the Archives; headed the Department for the Admission, Storage and Protection of Archival Documents; worked on the description of the contents of certain funds and making general means of information about archival holdings; on the preparation of archival holdings for publication within collections of documents; on the preparation of exhibitions of archival holdings and making of catalogues. As a member of working bodies, he worked on the drafting of professional instructions, rules, regulations on the protection of archival holdings, making of a list of categories, organisation and processing, drafting means of information, use of archival holdings, etc. He is the editor of some Archives publications. He is the editor of the Arhiv magazine, magazine of the Archives of Yugoslavia, member of the desk of the historical magazine History of the 20^th Century. In the past ten years, he organised and headed the Sector for the Protection, Information and Use of Archive Documents. He speaks Russian.

He was a member of the SARJ Presidency and secretary of the professional magazine The Arhivist. He participated as a member of the delegation of the Archives of Yugoslavia or the Archives of Serbia and Montenegro at international conferences organised by the International Council on Archives (ICA), where the Archives is an A category member. He was a member of the delegation to negotiations on the issues of succession of the "State Archives of the SFRY."

He participated at international conferences on history in the country and abroad.

In addition to his work in the archives, he published about ten books – collections of documents and monographs from the field of Serbian and Yugoslav diplomacy, especially on Serbian authors in diplomatic service (on Jovan Dučić, Ivo Andrić, Rastko Petrović, Branko Lazarević, Marko Ristić; monographs: Serbia and Greece 1914–1918, Echoes of Pašić’s Life and others). He published about twenty articles, contributions, reviews, etc. in professional and scientific magazines.