is a village located primarily in Cook County, Illinois, United States with a small portion in Will County. The population was 48,401 at the 2000 census, and 58,322 in the 2007 census. Tinley Park is one of the fastest growing suburbs south of Chicago.
According to the United States Census Bureau, the village has a total area of 15.0 square miles (38.8 km²), of which, 14.9 square miles (38.7 km²) of it is land and 0.04 square miles (0.1 km²) of it (0.27%) is water. The village lies on the Tinley Moraine and/or the Valparaiso Moraine.