We present a genome assembly from an individual male Amphipyra tragopoginis (the Mouse Moth; Arthropoda; Insecta; Lepidoptera; Noctuidae). The genome sequence is 806 megabases in span. Most of the assembly is scaffolded into 31 chromosomal pseudomolecules, including the assembled Z sex chromosome. The mitochondrial genome has also been assembled and is 15.3 kilobases in length. Gene annotation of this assembly on Ensembl has identified 13,359 protein coding genes.