In Hindu epics, Gajasura (Sanskrit: गजासुर, lit. 'elephant demon') is a generic name given to an asura (demon), who assumes the form of an elephant. It may refer to demons:

• the son of Mahishasura--killed by god Shiva: see Gajasurasamhara
• killed by Shiva and his head attached to his younger son and god of wisdom Ganesha: see Mythological_anecdotes_of_Ganesha#Shiva_and_Gajasura
• Gajamukhasura, defeated, and turned into a rat and made into a vahana (vehicle) by Ganesha
• killed by Rudras