Ioannis Sismanis () was a Hellenic Army general.
Born in Nafpaktia in about 1859, he became an NCO and was commissioned as an officer following graduation from the NCO School. He fought in the Greco-Turkish War of 1897, the Balkan Wars of 1912–13, the Macedonian front of World War I (1917–18) and in the Greco-Turkish War of 1919–22 until his retirement from service on 10 September 1921 (O.S.) with the rank of Major General.
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