Tillandsia caput-medusae is a species of flowering plant in the bromeliad family, Bromeliaceae, subfamily Tillandsioideae.

Common names include octopus plant and medusa's head.

An epiphyte native to Central America and Mexico, T. caput-medusae is a commonly cultivated bromeliad species.

The thick, channeled, tapering and twisting leaves are up to 25 cm (9.8 in) long and are covered in fine gray hairs.

Bright violet flowers are about 3.2 cm (1.3 in) long with the stamens exerted.