This open access book constitutes the refereed proceedings of the 23rd International Conference on Software Business, ICSOB 2023, which was held in Lahti, Finland, during November 27-29, 2023. The special theme of ICSOB 2023 was Digital Agility: Mastering Change in Software Business and Digital Services. The 27 full papers and 8 short papers presented in this book were carefully reviewed and selected from 79 submissions. They were organized in topical sections as follows: Requirements; software procurement; platforms, ecosystems and data; artificial intelligence; software startups; software product management; software and business co-development; and emerging digital world. .