CTA may refer to:
Ctags is a programming tool that generates an index (or tag) file of names found in source and header files of various programming languages.
Cancer/testis antigen 1 is a protein that in humans is encoded by the CTAG1B gene.
CTA International is an equal-shares joint venture company between defence companies Nexter and BAE Systems.
Ribosomal RNA-processing protein 7 homolog A is a protein that in humans is encoded by the RRP7A gene.
Apache cTAKES: clinical Text Analysis and Knowledge Extraction System is an open-source natural language processing system for information extraction from electronic health record clinical free-text.
The CTA Holiday Train is a Chicago 'L' train which traditionally runs during the winter holidays, from November to December.
The CTA-Arsenal is a French racing car which was developed by the Centre for the study of car and cycle technology then abbreviated as CTA but today renamed as the UTAC and constructed by Arsenal at Châtillon.