This book constitutes the refereed proceedings of the 15th European Conference on Ambient Intelligence, Am I 2019, held in Rome, Italy, in November 2019.The 20 full papers presented together with 10 short papers were carefully reviewed and selected from 50 submissions. The papers cover topics such as embedded devices that can merge unobtrusively and in natural ways using information and intelligence hidden in the network connecting these devices (e.g., the Internet of Things). The main topic of Am I 2019 was Data-driven Ambient Intelligence, which follows the vision of Calm Technology, where technology is useful but does not demand our full attention or interfere with our usual behavior and activities.