Walnut is a village in Bureau County, Illinois, United States. The population was 1,461 at the 2000 census. It is part of the Ottawa–Streator Micropolitan Statistical Area.
Don Marquis, author of "Archy and Mehitabel", was born in Walnut.
Walnut is located at 41°33′23″N 89°35′29″W / 41.55639°N 89.59139°W / 41.55639; -89.59139 (41.556404, -89.591503).