Gymnocalycium baldianum, the spider-cactus or dwarf chin cactus, is a species of flowering plant in the cactus family Cactaceae, native to the Catamarca Province in Argentina. There are many hybrids with a wide range of flower colours.
Gymnocalycium baldianum grows at elevations of 500 to 2000 metres above sea level. This high-altitude plant is often found among grass. Gymnocalycium baldianum has a relatively restricted range, has a continuous distribution and is not fragmented. Collection is a major threat for the species in parts of it range also fire affects it in some areas. The synonym name Gymnocalycium venturianum is very common in collections, and even at cactus nurseries. It is a very variable species in its general appearance. Gymnocalycium baldianum is very easy to grow, these plants offer no cultivation difficulties.