Arhopala zylda is a butterfly in the family Lycaenidae. It was discovered by Alexander Steven Corbet in 1941. It is found throughout Malaysia and Indonesia.
It is a small butterfly, with a wingspan of 17 millimeters. The male is slightly smaller (16 millimeters) and its upperside is bright shining blue. It has a narrow black border on the upperside.
Two subspecies are recognised-
Arhopala zylda is the only species of Arhopala that exhibit myrmecoxeny despite its host plants being myrmecophytes of Crematogaster decamera (Macaranga beccariana and Macaranga hypoleuca).