Autographa flagellum, the silver whip, is a moth of the family Noctuidae.

It is found in North America from Newfoundland west across southern Canada to south-eastern British Columbia, south in the east to Maine, Michigan and Wisconsin.

There are isolated reports from further south (Pennsylvania and Colorado).

Adults are on wing from June to August depending on the location.

The larvae feed on Liatris and Helianthus species.