This annual report for 2023 provides a review of the key activities and results of the Group for High Resolution Sea Surface Temperature (GHRSST) international science team and of the activities involving sea surface temperature users. Copyright 2024© European Union This report has been edited by the GHRSST Project Office, in performance of contractual activities: ‘Ownership 2024 European Union’. This copyright notice applies only to the overall collection of papers: authors retain their individual rights and should be contacted directly for permission to use their material separately. Editorial correspondence and requests for permission to publish, reproduce or translate this publication in part or in whole should be addressed to the GHRSST Project Office. The papers included comprise the proceedings of the meeting and reflect the authors’ opinions and are published as presented. Their inclusion in this publication does not necessarily constitute endorsement by GHRSST or the co-organisers. The GHRSST Project Office is funded by the European Union Copernicus Programme and is hosted by the Danish Meteorological Institute, Sankt Kjelds Plads 11, 2100 Copenhagen (DK).The GHRSST website is performed in the frame of the Sci4MaST project led by NOVELTIS and funded by the European Union Copernicus Programme.