This is an open access book. Envisioning a Sustainable Future: Synergizing Green Economy, Circularity, Smart Cities, and Digitalization through Applied Engineering. Envision a future where a thriving green economy coexists with smart cities and digital advancements. This conference is your launchpad to explore how these forces can revolutionise industries and practices. Dive into discussions on circularity, smart city optimization, and sustainable resource management through the lens of applied engineering. Witness cutting-edge innovations and collaborate with a diverse range of stakeholders – engineers, policymakers, and sustainability experts – to craft a resilient and thriving future. The "Envisioning a Sustainable Future" Conference is your chance to be part of the solution. Engage in thought-provoking sessions, network with like-minded individuals, and help shape a future where a green economy, smart cities, and digitalization work together to create a more sustainable and prosperous world. Don't miss this opportunity to be a catalyst for change!