Ioannis Kalogeras () was a Greek army officer and politician. He was born in Spartias, a small village of the mountainous area of Trichonis in Aetolia-Acarnania in Greece. He entered the Hellenic Military Academy in Athens and then went to France for supplementary studies at the École supérieure de guerre. Upon the outbreak of the First Balkan War in 1912, he was recalled from his studies in Paris, and placed in the staff of the 4th Infantry Division under Major General Konstantinos Moschopoulos. From this position, he participated in the battle of Sarantaporo and the drive to Thessaloniki. In December 1912, he suggested to Lt General Konstantinos Sapountzakis, and then to the Crown Prince Constantine the idea of capturing the strategic hill of Tsouka, west of the fortress of Bizani that w