Hovhannes XII Arsharuni (Armenian: Յովհաննես Արշարունի; Istanbul, 1854 – Istanbul, 21 January 1929) was an Armenian Patriarch of Constantinople.^[1]

Born in Constantinople, Hovhannes Arsharuni attended the Galatasaray High School. He taught at the local Armenian schools and was ordained as a cleric of the Armenian church in 1879. He was ordained archbishop in 1899. He became Patriarch of Constantinople in 1911 and was forced to resign in 1913.^{[citation needed]}

He died on January 21, 1929, and is buried at the Şişli Armenian Cemetery.^{[citation needed]}