Even if already numerous hot gas filter systems are installed, hot gas filtration with all its aspects is still not known enough. Hot gas filtration offers significant advantages in many cases. Processes can be simplified or intensified, process efficiency can be increased, contamination of products or blocking by condensation or desublimation can be prevented, and downstream equipment can be protected. The paper describes the fundamental particularities of filtration at higher temperatures and provides an overview of filter media and filter systems for hot gas filtration. Moreover, applications of hot gas filtration are presented.