The Illinois Service, branded Amtrak Illinois, comprises three passenger rail routes operated by Amtrak in the American state of Illinois. The Illinois Service is funded primarily by the Illinois Department of Transportation (IDOT) and falls under the broader Amtrak Midwest brand.

Amtrak Midwest is a brand name applied by Amtrak to its state-supported routes in the Midwest states of Illinois, Michigan, Wisconsin, and Missouri. As of 2024, Amtrak Midwest consists of ten named trains:Illinois Service: Lincoln Service, Illinois Zephyr and Carl Sandburg, and Illini and Saluki Michigan Services: Blue Water, Wolverine, and Pere Marquette Hiawatha Service Missouri River Runner