Thanks to the actual programs of extensive observation and exploration of Mars and Titan, our knowledge of these planetary bodies has greatly improved. Atmospheric phenomena and landscapes on Mars and Titan bear striking resemblance with those on Earth. In particular, extensive dune fields were observed on these distant bodies, showing that dunes can form throughout the solar system under extremely various planetary environments. Dunes provide a powerful tool to investigate the physics of granular media, but also the sedimentary and climatic history of arid and semi-arid environments (such as on Earth deserts, and more globally on Mars and Titan). However, despite intensive studies of planetary dunes, many questions regarding their origins, composition, morphology, age and dynamics under present and past climatic conditions remain unanswered. Contributions that use theory of grain mechanics and sediment transport, numerical modelling, laboratory experiments, field and remote sensing data, with the aim at studying the processes through which dunes form and shape on Earth, Mars and Titan are encouraged.