Arūnas Bubnys (born November 7, 1961) is a Lithuanian historian and archivist. He started his studies at Vilnius University in 1985. In 1993 he received a Ph.D. for the thesis Lietuvių antinacinė rezistencija 1941–1944 m. (English: Lithuanian Anti-Nazi Resistance 1941-1944).
From 1985 on he worked in the Lithuanian Institute of History. In 1993-1998 he was the director of Lithuanian Special Archives. Currently, he works at the Genocide and Resistance Research Centre of Lithuania and is a member of the International Commission for the Evaluation of the Crimes of the Nazi and Soviet Occupation Regimes in Lithuania.