The Till Plains are a physiographic region of the United States that cover parts of the north-central and northeastern regions of the country. The region is called the Till Plains because of the glacial till left by the receding glaciers that covered the area as recently as 20,000 years ago. The Till Plains generally have slightly rolling to undulating lowlands. In some places, the landforms take on a hummocky appearance because ridges of end moraine occur among till plains of the ground moraine. The ridges rise slightly above the general level and are made up of till deposited along the edge of the glaciers.

The most extensive area of the Till Plains is in Iowa, Illinois, and Indiana, where the region constitutes almost the entire state. The Till Plains also extend into small parts of Missouri, Minnesota, Nebraska, Ohio, Wisconsin, Michigan, and New York. The major cities located in the Till Plains include Chicago, Indianapolis, Cincinnati, Des Moines, and Omaha.