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Vortices are ubiquitous structures in fluid mechanics spanning the range of scales from nanofluidics and microfluidics to geophysical and astrophysical flows. Vortices hold the key to understanding many different phenomena. As a result, the subject of vortex dynamics continues to evolve so as to constantly find new applications in biology, bio-technology, industrial and environmental problems. Vortices can be created by separation of a flow from the surface of a body or a density interface, and evolve into coherent structures. Once formed, a vortex acquires a function, depending on its individual structure. In this way, for example, insects gain lift and fish gain thrust. Surprisingly, despite the long history of vortex dynamics, only recently has knowledge about formation, structure and function of vortices been combined to yield new perspectives in the subject, thereby helping to solve outstanding problems brought about by modern advances in computer technology and improved experimental techniques. Vortex dynamics was born from Helmholtz's deep insight that a vortex line is frozen into the fluid and hence a topological invariant. The study of vortices in aeronautical applications (jet aircraft) boosted interest in vortex dynamics in the late 1960s. The IUTAM Symposia on Vortex Dynamics have enjoyed over half a century of success, and have recently been held approximately every three years. The proposed symposium seeks to bring together leading researchers for fruitful interactions and to spur new breakthroughs in the subject. Topics to be covered include equilibria, instability and nonlinear dynamics (discrete and continuous spectra, dynamical systems theory, chaos and chaotic mixing, and turbulence), vortex separation and breakdown, body-vortex interactions, vortex formation from disintegration of bubbles, biological vortex dynamics (fish and insect locomotion through to cardiology and human physiology), wake studies, energy and environmental problems (e.g. wind turbines), MHD vortices (instabilities and astrophysical applications) and vortices in atmospheres and oceans.