Riley's Opal (Poecilmitis rileyi) là một loài butterfly in the Lycaenidae family. It is endemic to South Africa, ở đó nó is known only from hill slopes and river flats at the east end of the Brandvlei Dam in the West Cape.
The wingspan is 30–35 mm for males and 32–38 mm for females. Adults are on wing from September to April, with peaks from October to November and in March.
The larvae feed on Thesium and Zygophyllum species. They are attended to by Crematogaster peringueyi ants.
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