The Mathematical Council of the Americas welcomes special session proposals for the next Mathematical Congress of the Americas (MCA 2025), Miami, USA, July 21-25, 2025. Organizational teams should have representation from two or more countries in the Americas, and proposals should be topically broad, with the potential to bring together diverse groups of researchers from multiple countries in the Americas. Proposals will be reviewed on a rolling basis, so early submission is encouraged. We have space for roughly 60 special sessions. More information and instructions for submitting a proposal may be found here.