Mirko Valentić (born 19 September 1932) is a Croatian historian.

Mirko Valentić was born on 19 September 1932 in Ivanjska near Banja Luka, then part of the Vrbas Banovina, Kingdom of Yugoslavia (modern-day Bosnia and Herzegovina).^[1] In 1961 he graduated from the Faculty of Humanities and Social Sciences, University of Zagreb with a degree in History and received his doctorate in 1978 with the thesis "Hrvatsko-slavonska Vojna krajina i pitanje njezina sjedinjenja s Hrvatskom 1849.-1881" (Croatian-Slavonian Military Border and the question of its unification with Croatia 1849-1881).^[1] Since 1993 he has worked as a professor at the Croatian Studies of the University of Zagreb Department of History, Course Croatia from the 16th to the 18th century.

Since 2005 he has been a member of the council for the preparation of Amicus curiae before the International Criminal Tribunal for the Former Yugoslavia.^[1]

His research topics include the Military Frontier; Transport integration and Adriatic orientation of Croatia; Migration and colonization processes during the 16th and 17th centuries; Burgenland Croats; and "Greater Serbian projects" of the 19th and 20th centuries.^[1]

• Kameni spomenici Hrvatske XIII-XIX stoljeća, Zagreb, 1969.
• Gradišćanski Hrvati od XVI stoljeća do danas, Zagreb, 1970.
• Die Burgelaendische Kroaten, Eisenstadt: Landesmuseum Eisenstadt, 1972.
• The Military Frontier and the Question of Its Unification with Croatia, 1849–1881, Zagreb, 1981.
• Vojna krajina u Hrvatskoj, Zagreb, 1981.
• O etničkom korijenu hrvatskih i bosanskih Srba, Zagreb, 1992.
• Das Eisenbahnnetz in der Militaergrenze Plaene und Verwirklichung, Wien, 1993.
• Hrvatska na tajnim zemljovidima 18. i 19. st. Sv. 10: Varaždinska županija Zagreb, 2006
• Rat protiv Hrvatske - 1991. - 1995. - Velikosrpski projekti od ideje do realizacije, Zagreb, 2010.
• War against Croatia 1991 - 1995: Greater Serbian projects from idea to implementation, Zagreb - Slavonski Brod, 2012.

Časni znak zemlje Gradišće (2013)^[2]