TCI may refer to:
Locations Tenerife Airport (disambiguation), airport code of Tenerife International Airport (1964–1978), still used as a code for the island of Tenerife in general Turks and Caicos Islands, UNDP country code
Psychology Temperament and Character Inventory (TCI) of personality traits Theme-centered interaction, a method for social learning in groups Therapeutic Crisis Intervention, protocol used in residential childcare facilities
Organizations and companies Tall Clubs International, organization of clubs of tall people in North America Tele-Communications Inc., former US cable television company Telecommunication Company of Iran Televisione Cristiana in Italia, an Italian religious television channel Telus Communications Inc., a Canadian telecommunications subsidiary of Telus Corporation Tennessee Coal, Iron and Railroad Company, former steel manufacturer, Alabama, USA Texas Correctional Industries, division of Texas Department of Criminal Justice, USA The Children's Investment Fund Management, UK hedge fund management Thistletown Collegiate Institute, a school in Toronto, Canada Touring Club Italiano Tokyo Chemical Industry, a global manufacturer of specialty organic chemicals Toyota Canada Inc. Transport Corporation of India Transportation and Climate Initiative, a proposed interstate compact
Other Tag Control Information, a data field in IEEE 802.1Q VLAN tagging Taoist Church of Italy, a confessional religious body of Taoism in Italy Target controlled infusion, a method of administering general anaesthesia