Absolute Magnitude is an American discontinued, semi-professional science fiction magazine started in Spring/Summer 1993 issue under the name Harsh Mistress.

Absolute Magnitude was published by DNA Publications and edited by Warren Lapine.

[1] Absolute Magnitude was nominated for the 2002 Hugo Award for Best Semiprozine with Lapine noted as the editor.

[3] Absolute Magnitude is also a collection of sixteen stories taken from the magazine between 1993 and 1997.

The anthology was published by Tor Books and was released on April 15, 1997.