Based on the third International Conference on Symmetries, Differential Equations and Applications (SDEA-III), this proceedings volume highlights recent important advances and trends in the applications of Lie groups, including a broad area of topics in interdisciplinary studies, ranging from mathematical physics to financial mathematics. The selected and peer-reviewed contributions gathered here cover Lie theory and symmetry methods in differential equations, Lie algebras and Lie pseudogroups, super-symmetry and super-integrability, representation theory of Lie algebras, classification problems, conservation laws, and geometrical methods.

P. J. Olver, Normal Forms for Submanifolds under Group Actions.- M. Gürses and A. Pekcan, Integrable Nonlocal Reductions.- A. Ruiz and C. Muriel, Construction of Solvable Structures from so(3,C).- H. M. Dutt and A. Qadir, Classi¿cation of Scalar Fourth Order Ordinary Di¿erential Equations Linearizable via Generalized Lie-Bäcklund Transformations.- R. Mohanasubha, V. K. Chandrasekar, M. Senthilvelan and M. Lakshmanan, On the Symmetries of a Liénard Type Nonlinear Oscillator Equation.- S. V. Meleshko, Symmetries of Equations with Nonlocal Terms.- R. Naz and F. M. Mahomed, A note on the Multiplier Approach for Derivation of Conservation Laws for Partial Di¿erential Equations in the Complex Domain.- B. Muriel, J. L. Romero and A. Ruiz, The Calculation and Use of Generalized Symmetries for Second-Order Ordinary Differential Equations.- A.Aslam, A. Qadir and M. Safdar, Differential Invariants for Two and Three Dimensional Linear Parabolic Equations.- O. K. Pashaev and A. Koçak, Kaleidoscopeof Classical Vortex Images and Quantum Coherent States.