Phyllonorycter formosella is a moth of the family Gracillariidae. It is known from the Seychelles.
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Insecta |
| Order: | Lepidoptera |
| Infraorder: | Heteroneura |
| Family: | Gracillariidae |
| Genus: | Phyllonorycter |
| Species: | P. formosella |