St. John's Church is a Church of Ireland church located in Ballymore Eustace, County Kildare, Ireland. The current church, built in 1820, consecrated in 1822 and extended in 1894, stands close to the site of a medieval church first mentioned in 1192. The church, which cost £900 to build, was financially assisted by the Board of First Fruits, and included extensive use of local granite.