We present a genome assembly from an individual maleErebia ligea(Arran brown; Arthropoda; Insecta; Lepidoptera; Nymphalidae). The genome sequence is 506 megabases in span. The majority (99.92%) of the assembly is scaffolded into 29 chromosomal pseudomolecules, with the Z sex chromosome assembled. The complete mitochondrial genome was also assembled and is 15.2 kilobases in length.