CSIO may refer to:

• Central Scientific Instruments Organisation, an Indian national laboratory dedicated to research, design and development of scientific and industrial instruments
• Centre for Study of Insurance Operations, the Canadian property and casualty insurance industry's nonprofit association of insurers, brokers and software providers
• Concours de Saut International Officiel, a ranking system for the equestrian competition show jumping
• Chief Science Information Officer, is a research executive within a healthcare organization generally responsible for the research informatics platform.

• ITC Bookman
• ITC (disambiguation)
• ITC e-Choupal Initiative
• IT certification
• ITCF
• ITC Grand Chola Hotel
• Itcha
• Itcha (disambiguation)
• Itcha-Ilgachuz
• Itcha-Ilgachuz Provincial Park
• It Changed My Life: Bikini Kill In The UK
• It Changed My Life: Bikini Kill In The U.K.
• It (character)
• Itchen Canal
• Itchen (disambiguation)
• Itchen ferry
• Itchen Ferry village
• Itchenor
• Itchenor Sailing Club
• Itchenor SC
• Itchen, Test and Avon (European Parliament constituency)
• Itchimbia
• Itchimbía
• Itchingfield
• Itching purpura