"Machines, Mechanisms and Robots: Theory and Applications (MMR-T&A)" is an interdisciplinary collection, published in MDPI's journal Machines, that is focused on Mechanical Systems analyzed from both the theoretical and the applicative points of view. It aims to report scientific advancements in all fields concerning mechanical system design.

This reprint marks the beginning of the MMR-T&A series, which compiles articles from the MMR-T&A collection. This first volume includes the first ten published papers from the collection. It starts with one review on contact models. Then, it continues with two papers addressing obstacle avoidance in different contexts, one more paper on geometric constraint programming, and three papers presenting novel mechanisms. Finally, it closes with one paper on mechanism performances and two papers addressing manufacturing issues. Going forward, a new volume in the MMR-T&A series will be released for every ten papers published.

This reprint is dedicated to the memory of Prof. Ettore Pennestrì (Reggio Calabria, Italy, May 16, 1957 - Rome, Italy, August 29, 2024).