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