CTU may refer to:
Schools Can Tho University, Vietnam Capitol Technology University, Maryland Catholic Theological Union, Illinois Cebu Technological University, Philippines Chienkuo Technology University, Taiwan Chunnam Techno University, South Korea Colorado Technical University Czech Technical University in Prague
Organizations Caribbean Telecommunications Union Chicago Teachers Union, a labor union Conservative Trade Unionists, UK New Zealand Council of Trade Unions CHH Txuri Urdin, a Spanish ice hockey team Corporate Training Unlimited, a security contracting firm operating in Iraq
Other Chandigarh Transport Undertaking, India Chengdu Shuangliu International Airport (IATA airport code), China Clinical trials unit Coding tree unit, the basic processing unit of the High Efficiency Video Coding (HEVC) video standard Combustion Turbine Unit, a type of gas turbine Counter Terrorist Unit, a fictional government agency from the television series 24