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is a city in LaSalle County, Illinois, United States. The population was 9,835 at the 2000 census. It is part of the Ottawa–Streator Micropolitan Statistical Area.
According to the United States Census Bureau, the city has a total area of 6.1 square miles (15.7 km²), of which, 5.9 square miles (15.4 km²) of it is land and 0.1 square miles (0.3 km²) of it (1.82%) is water.
Located on the Illinois River, Peru lies west of the intersection of two major interstate highways: Interstate 39 and Interstate 80. The city is also near the western terminus of the historic Illinois and Michigan Canal. Starved Rock State Park, a regional tourist attraction, is located south-east of the community. Peru has a twin city on its eastern edge, LaSalle.