Hatiora gaertneri (formerly Rhipsalidopsis gaertneri), popular spring-flowering cactus of the family Cactaceae, with flattened stems, grown for its bright-red blossoms that appear about Easter time in the Northern Hemisphere. The related H. rosea is the so-called dwarf Easter cactus, a diminutive plant with abundant fragrant rose-pink flowers. A period of cool temperature (10 °C; about 50 °F) during winter is essential to bring on the best flower buds.

These cacti—native to rainforests of Brazil, where they are epiphytes (grow on other plants)—have also been considered members of the genus Rhipsalis; they were formerly grouped with Schlumbergera species, such as the Thanksgiving and Christmas cacti.