Gracilaria isabellana
- kingdom: Plantae
- phylum: Rhodophyta
- class: Florideophyceae
- order: Gracilariales
- family: Gracilariaceae
- genus: Gracilaria
- species: Gracilaria isabellana
- Puerto Limón
Limón
Costa Rica- Port Royal
Kingston
Jamaica- Lamboglia
Patillas
Puerto Rico- Atlantic Beach
- Inwood
- Lawrence
New York
United States- Saint Croix
Saint Croix Island- Charlotte Amalie
Saint Thomas Island
Virgin Islands, U.S.