| Ilha do cabo Frio Biological Reserve | |
|---|---|
| Reserva Biológica da Ilha do Cabo Frio | |
 The island and beach (background) from above Pontal do Atalaia beach (foreground) on the mainland | |
  | |
| Nearest city | Arraial do Cabo, Rio de Janeiro |
| Coordinates | 22°59′42″S 41°59′20″W / 22.995°S 41.989°W |
| Area | 700 hectares (1,700 acres) |
| Designation | Biological reserve |
| Created | 1990 |
| Administrator | Municipality |
Ilha do cabo Frio Biological Reserve (Portuguese: Reserva Biológica da Ilha do Cabo Frio) is a municipal biological reserve in the state of Rio de Janeiro, Brazil. It covers an Atlantic island with a unique micro-climate.