This two-volume set LNCS 14025 and 14026 constitutes the refereed proceedings of the 15th International Conference on Social Computing and Social Media, SCSM 2023, held as part of the 25th International Conference, HCI International 2023, held in Copenhagen, Denmark in July 2023.

The total of 1578 papers and 396 posters included in the HCII 2023 proceedings was carefully reviewed and selected from 7472 submissions.

The SCSM 2023 conference offers a wide range of topics related to the design, development, assessment, use, and impact of social media.