Dendrobium gratiosissimum is a species of genus Dendrobium. It blooms in spring with 1 to 3 flowers. Flowers are 6 to 7 cm wide.

Dendrobium gratiosissimum is found in dry deciduous and evergreen lowland and montane forest in Hainan China, Assam, Laos, Thailand Vietnam and Burma at elevations of 0 to 1600 meters. It grows in cool to hot temperatures with medium amounts of light. Keep plant moist and fertilize during growth season. During winter reduce watering until new shoots appear.