Ioannis Antonopoulos (Greek: Ιωάννης Αντωνόπουλος, 1810 - October 28, 1882) was a Greek politician and a of Patras. He was born in Patras and was the son of Dimitrios Antonopoulos. He later studied law in Corfu and worked as a judge. He was elected mayor of Patras in 1851 and served until 1885. He was elected several times to the public council and attempted to become president of the municipal chamber. He organised the paving of the city's streets, constructed several fountains and lighted . He died on August 2, 1882.