Dendrobium cuthbertsonii is a species of orchid in the genus Dendrobium. It grows epiphytically at up to 10000 ft above sea level in New Guinea and the Bismarck Archipelago. It is targeted by commercial collectors who harvest it for export. It has one of the longest floral durations of any orchid, with individual flowers remaining open for up to nine months. Another source says ten months. Its stems are 1 - 2 cm tall and 4 - 7 mm wide; the flowers are 25 - 40 mm long, 13 - 35 mm wide, and extremely variable in colour., ranging from crimson through orangey-red.