Juncus vaseyi is a species of flowering plant in the rush family Juncaceae.

The specific epithet vaseyi honors the American botanist George Vasey.

[2] The type specimen was collected a "few years" earlier by Dr. George Vasey along the Fox River near Ringwood, Illinois.

[4] Since Vasey had "paid a good deal of attention to this genus", Engelmann named the species in his honor.

[1] In Illinois, where the type specimen was collected during the mid-19th century, the species is possibly extirpated (SH).