Grantiidae is 'n familie van sponsdiere uit die klas van die Calcarea (kalksponse).
Genusse Amphiute (Hanitsch, 1894) Aphroceras (Gray, 1858) Grantia (Fleming, 1828) Leucandra (Haeckel, 1872) Leucandrilla (Borojevic, Boury-Esnault & Vacelet, 2000) Leucettaga (Haeckel, 1872) Sycandra (Haeckel, 1872) Sycodorus (Haeckel, 1872) Sycute (Dendy & Row, 1913) Synute (Dendy, 1892) Teichonopsis (Dendy & Row, 1913) Ute (Schmidt, 1862)