Botanophila seneciella, the ragwort seed fly or ragwort seed head fly, is a fly species in the family Anthomyiidae.

Larvae feed within seed heads of Jacobaea vulgaris (the tansy ragwort), often destroying all of the developing seeds.

[4] It is also found feeding on Senecio vulgaris (the groundsel).

[5] Together with the cinnabar moth (Tyria jacobaeae) and the tansy ragwort flea beetle (Longitarsus jacobaeae), the ragwort seed fly can be used for the biological control of the tansy ragwort.

[2] It has been approved and released for Senecio control in California, Australia and elsewhere.