TCI

TCI may refer to:

Medicine

• Transient Cerebral Ischaemic attack, see Transient ischemic attack
• Tricyclic antidepressant medication
• Target Controlled Infusion, a method for controlling intravenous infusions.

Psychology

• Theme-Centered Interaction, a method of psychotherapy by Dr. Ruth Cohn
• Temperament and Character Inventory, a psychological profiling of personality.

Other

• Tall Clubs International, the parent organization to many clubs of tall people in North America
• Touzing Club International, a French philanthropic institution
• Technical Cost Innovation
• Total Cost of Investment
• Total Comfort Installation
• Telecommunication Company of Iran, the leading telecom in Iran
• Tele-Communications Inc., a now-defunct cable television company, acquired by AT&T and then by Comcast
• Tennessee Coal, Iron and Railroad Company, a defunct Alabama-based steel manufacturer acquired by U.S. Steel
• Texas Correctional Industries, a division of the Texas Department of Criminal Justice
• The Children's Investment Fund, a London-based hedge fund
• Therapeutic Crisis Intervention, a crisis management protocol used in residential childcare settings
• Thistletown Collegiate Institute, a school in the Toronto District School Board
• Touring Club Italiano
• Transport Corporation of India Ltd, Largest Transport Co. in India
• Travel Club International, a travel club.
• Turks and Caicos Islands, a British territory consisting of two West Indian island groups in the Atlantic Ocean
• Technology Competitor Intelligence, aka Competitor Technology Intelligence - the study of Competitor Technology Strategies and their role in defining Company Business Strategies
• Teachers' Curriculum Institute, a K-12 education company focused on social studies, history, geography, government and economics.
• Tag Control Information, a data field in IEEE 802.1Q VLAN tagging
• Televisione Cristiana in Italia, an Italian TV channel