CSTA may refer to: California Science Teachers Association Canadian Seed Trade Association Center for SCREEN-TIME Awareness Combat Systems Test Activity, Aberdeen Proving Ground, Maryland Community of Scientific and Technological Activities , a student activity in faculty of pharmacy Helwan university. Computer Science Teachers Association Computer-supported telecommunications applications Constant Slope Timed Automata Council of Science and Technology Advisors - a Canadian S&T Committee Cystatin A, a protein Czech and Slovak Transatlantic Award Peptide Transporter Carbon Starvation Family, a family of transporter proteins