The two-volume set LNCS 12794-12795 constitutes the refereed proceedings of the 9th International Conference on Culture and Computing, C&C 2021, which was held as part of HCI International 2021 and took place virtually during July 24-29, 2021.The total of 1276 papers and 241 posters included in the 39 HCII 2021 proceedings volumes was carefully reviewed and selected from 5222 submissions.The papers included in the HCII-C&C volume set were organized in topical sections as follows:Part I: ICT for cultural heritage; technology and art; visitors' experiences in digital culture;Part II: Design thinking in cultural contexts; digital humanities, new media and culture; perspectives on cultural computing.