Ioannis Zaimis (Greek: Ιωάννης Ζαΐμης, 1797–1882) was a Greek politician of Achaia and the first Mayor of Patras.
He was born in 1797 and was the son of Asimakis Zaimis, part of the famous Zaimis family that produced famous revolutionary heroes. He took part of the revolution of 1821 and battled for Patras. He married Angeliki Kanakari-Roufo. He became the first mayor of Patras in 1836 and was an antiroyalist. A year later, he would leave the mayor's seat and Ioannis Boukaouris took over as the second mayor. In the second municipal (city) election in 1837, he was president of the municipal countil. He was a politician of Kalavryta in 1841 and in 1843, he returned being a municipal council. 150 years later, a relative of his family Andreas Zaimis became without luck in the mayor's seat.
He died on September 24, 1882. He was uncle of the Prime Minister Thrasivoulos Zaimis.