This reprint, "Advanced Studies of Thermoelectric Systems", brings together a collection of research contributions that highlight the latest advancements in thermoelectric technology. This reprint covers a broad spectrum of research topics-ranging from novel material development to the practical deployment of thermoelectric generators in advanced technological systems. The targeted audience for this reprint is wide, including researchers, engineers, and industry professionals interested in the latest developments in energy efficiency, material science, and thermoelectric engineering.