The Cathleen Synge Morawetz Prize is for an author(s) of an outstanding research publication. A series of closely related publications can be considered if they are clearly connected and focused on the same topic. The recipient(s) shall be a member of or have close ties to the Canadian mathematical community. The Cathleen Synge Morawetz Prize will be awarded according to the following 6-year rotation of subject areas: 1. Geometry and Topology (2021, and every six years thereafter), 2. Combinatorics, Discrete mathematics, Logic and foundations, and Mathematical Aspects of Computer Science (2022 , and every six years thereafter), 3. Applied mathematics, including but not limited to Numerical Analysis and Scientific Computing, Control Theory and Optimization, and Applications of Mathematics in Science and Technology (2023, and every six years thereafter), 4. Probability and Mathematical Physics (2024, and every six years thereafter), 5. Algebra, Number theory, Algebraic geometry (2025, and every six years thereafter), 6. Analysis and Dynamical systems (2026, and every six years thereafter).