Republic of Armenia may refer to:
First Republic of Armenia (1918-1920), officially known as Republic of Armenia Republic of Mountainous Armenia (1921) Armenian Soviet Socialist Republic (Armenian SSR) (1920–1922, 1936–1991), also known as Soviet Armenia or the Second Republic of Armenia Armenian Republic, present-day Armenia (1991-present)
See also Republic of Artsakh previously known as Nagorno-Karabakh Republic, a breakaway de facto Armenian state and republic (1994-present)