Jay Em is an unincorporated community in northern Goshen County, Wyoming, United States, just below the headwaters of the Rawhide Creek, on the old Texas Trail.

By 1869, Moore had the second largest cattle ranch in the Wyoming Territory, under the brand "J Rolling M", from which the community and "Jay Em Creek" would take later their names.

A newspaper, the weekly Jay Em Sentinel and Fort Laramie News (circulation 300) ran from 1917 to 1921.

Also still standing are a gas station, a lumber mill, the general and hardware stores, the stone cutting business, and a bank.

[4] Public education for the community of Jay Em is provided by Goshen County School District #1.