South Gull Lake is a census-designated place (CDP) in Ross Township, Kalamazoo County, in the U.S. state of Michigan.

It includes the unincorporated communities of Yorkville, Gull Lake, and Midland Park and does not have any legal status as an incorporated municipality.

The CDP is in northeastern Kalamazoo County, in the northwest part of Ross Township, and comprises area around the southern and eastern shores of Gull Lake.

The lake extends into Richland Township to the west, and the northern tip crosses into Barry County, areas which are outside the CDP.

The racial makeup of the CDP was 99.48% White, 0.13% Native American, 0.07% Asian, and 0.33% from two or more races.