圣若昂迪梅里蒂是巴西的城市，位于该国东南部，由里约热内卢州负责管辖，始建于1647年，面积34平方公里，海拔高度19米，受热带气候影响，2008年人口468,309。

São João de Meriti (Portuguese pronunciation: [ˈsɐ̃w ʒuɐ̃w ˈdʒi meˈɾitʃi]) is a Brazilian municipality in the state of Rio de Janeiro. Its historical name is São João do Rio Meriti. Its population was 598,456 inhabitants in 2013. It's located in the region of Baixada Fluminense, having 34.996 km² (13.451 square miles).