Argyresthia semitestacella is a moth of the family Yponomeutidae.

The head is yellowish white.

Forewings are light ferruginous-brown, faintly purplish tinged; a thick whitish dorsal streak to tornus, interrupted by a dark ferruginous-brown triangular median spot.

[4][5] In the United Kingdom, the moth flies from August to September.

This article on a moth of the family Yponomeutidae is a stub.