This is to announce the 30th annual meeting of the "Foundational Methods in Computer Science" (FMCS) workshop which will be held in-person at Mount Allison University in New Brunswick, Canada from June 7th to 11th, 2023. This year's scientific program will continue to welcome talks from all areas of category theory and theoretical computer science. For a sample of the most recent iteration of the workshop and its talks, see: https://pages.cpsc.ucalgary.ca/~robin/FMCS/FMCS2022/FMCS2022.html For further information on this year's meeting, including registration and accommodation details, please see the website https://www.reluctantm.com/gcruttw/fmcs2023/ All the best, Geoff Cruttwell [For admin and other information see: http://www.mta.ca/~cat-dist/ ]