Amboy is a city in Lee County, Illinois, United States, along the Green River. The population was 2,500 at the 2010 census. The chain of Carson Pirie Scott & Co. began in Amboy when Samuel Carson opened his first dry goods store there in 1854. The Christian denomination Community of Christ, formerly the Reorganized Church of Jesus Christ of Latter Day Saints, had a general conference in Amboy on April 6, 1860, at which time Joseph Smith III reorganized the church founded by his father Joseph Smith, Jr.

Lee County is a county located in the U.S. state of Illinois. According to the 2020 census, it has a population of 34,145. Its county seat is Dixon.