Arup or ARUP may refer to:
- Arup (name), an Indian male given name, meaning "formless" in Sanskrit
- Arupajhana, formless meditation in Buddhism
- Arup Group, a multinational professional services firm
- Arup Manufacturing Corporation, an aircraft manufacturer
- ARUP Laboratories, a national reference laboratory at the University of Utah
- Angle-resolved photoemission spectroscopy
- Arup Kotha, also known as Bedeni, an unfinished Bengali film directed by Ritwik Ghatak