The ICT4S'23 Demonstrations and Poster Track ofers an interactive opportunity for researchers and practitioners to show of recent advances, ideas, and experiences to the ICT4S community. Demonstrations and Posters help start conversations that could lead to new collaborations and help researchers and graduate students to meet faculty from other universities. The Demonstrations and Posters Track aims to accomplish a wide range of goals, including: • Knowledge transfer between academic and industry participants • Stimulating networking between existing or new ideas, research, and projects • Connecting graduate students to community members, researchers, and faculty • Facilitating new collaborations and projects • Presenting cutting-edge research results with scientific members This year's edition of the track has attracted 21 submissions. Each submission was reviewed by at least two reviewers, and then discussed by the track chairs. Of these, 14 submissions were accepted for presentation. Four accepted submissions were withdrawn due to travelling constraints. Finally 10 submissions were presented, nine as posters and one as a demonstration. These 10 submissions are included in these proceedings and listed in the following section.