Illinois Route 62 is an east–west state road in northeast Illinois. It runs from downtown Algonquin at Illinois Route 31 (Main Street) to the intersection with Illinois Route 83 (Elmhurst Road) by industrial Mount Prospect. This is a distance of 20.82 miles (33.51 km).

Illinois 62 is called Algonquin Road for its entire length, and is a northern parallel to Interstate 90. It is one of the few state roads in Illinois to be shorter than the name of the road that it marks, as Algonquin Road continues westward as McHenry CR A48 to Illinois Route 47 (about 8 miles (13 km), or 13 km), eastward as a local road to Oakton Street and Riverside Drive by Interstate 294 (about 5 miles (8.0 km), or 8 km), and northward as a local road to U.S. Highway 14 (about 5 miles (8.0 km), or 8 km) in Fox River Grove. The eastward extent of Algonquin Road is mainly residential, however.

SBI Route 62 was Algonquin to Chicago along the current Illinois 62. It followed Oakton Street and Talcott Road (in Park Ridge) to reach Illinois Route 43. In 1974, Illinois 62 was dropped east of Illinois 83.