JTAC may refer to:
JTAC Hill, a fort in Helmand Province, Afghanistan Joint Terrorism Analysis Centre, advises the UK government on terrorist threats Joint Terminal Attack Controller, someone who directs aircraft in a military operation Advanced Mobile Phone System#TACS.2C ETACS and JTAC variants, an analogue mobile phone standard, also known Japanese Total Access Communication Juniper Networks Technical Assistance Center Journal of Thermal Analysis and Calorimetry, a scientific journal