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is a village in Cook County, Illinois, United States. It is a northwestern residential suburb of Chicago. As of the 2000 census, the village had a total population of 65,479, making it the sixth-largest community in Cook County and the 16th-largest in the state of Illinois at that time. In 2005 its population was estimated to be 67,232.
According to the United States Census Bureau, the village has a total area of 13.1 square miles (34.0 km²), of which, 13.0 square miles (33.6 km²) of it is land and 0.1 square miles (0.3 km²) of it (0.99%) is water.
Palatine is in a wooded marshland where several streams rise around the village. Most of these streams meet up with the Salt Creek which rises at Wilke Marsh on the village's east side. The most notable exception is the northeast side, where its streams lie in the Buffalo Creek watershed. A small part of the east and southeast sides lies in the McDonald Creek watershed. As a consequence, floods occur very frequently in Palatine.