Konstantin Jovanović (Serbian Cyrillic: Константин Јовановић; Bulgarian: Константин Йованович; 13 January 1849 – 15 February 1923) was a Serbian and Bulgarian[3][4] architect known for providing the original designs of the National Assembly of Bulgaria and National Assembly of Serbia buildings.

[6] Konstantin Jovanović finished a classical high school in Vienna and graduated from the Zürich Polytechnic in Switzerland in 1870 with honours.

[9] Jovanović commenced his career as an architect in Vienna,[7] though he was most active in the Kingdom of Serbia and the Principality of Bulgaria.

[8] Jovanović also created the first and basic design of the Neo-Renaissance National Assembly of Bulgaria building, the construction of which began on 4 June 1884.

His first projects in the Serbian capital were the private houses of lawyer Marko Stojanović and Dragomir Radulović.