Galanthus reginae-olgae has revolute leaves that are dark green with a central silver line and when fully grown are 11–15 cm long by 3–8 mm wide. Its flowers have three larger outer tepals, pure white, and three smaller inner tepals, white with variable green markings near the tips. The outer tepals are about 15–35 cm long, the inner ones 9–12 mm long. Populations of Galanthus reginae-olgae that flower at different times, with or without the leaves being fully developed, have been described as separate species or subspecies. Those described as G. reginae-olgae subsp. reginae-olgae flower in the autumn, either before the leaves develop or with the leaves. Those described as G. reginae-olgae subsp. vernalis flower in late winter or early spring, with the leaves.