Globia subflava, the subflava sedge borer or yellow sedge borer, is a moth of the family Noctuidae.

The species was first described by Augustus Radcliffe Grote in 1882.

[1][2] It is found in North America from Nova Scotia west to British Columbia, south to New Jersey in the east and Utah and California in the west.

Adults are on wing in July depending on the location.

The larvae bore the stems of Typha and Scirpus species.