Special Issue of the journal "Markov Processes and Related Fields" containing papers presented at the meeting: Inhomogeneous Random Systems (Paris, January 26-27, 2010). Editors: Ellen Saada, Thierry Gobron, François Dunlop. pp. 1-8: Introduction. pp. 9-30: N. Kurt: "Laplacian Interface Models with Strictly Convex Potential". pp. 31-66: X. Blanc, R. Costaouec, C. Le Bris and F. Legoll, "Variance Reduction in Stochastic Homogenization Using Antithetic Variables" pp. 67-70: G.R. Grimmett, "Stochastic Geometry and Statistical Mechanics". pp. 71-88: T. Bodineau, B. Graham, "Helffer - Sjostrand Representation for Conservative Dynamics". pp. 89-110: F. Camia, "Towards Conformal Invariance and a Geometric Representation of the 2D Ising Magnetization Field". pp. 111-156: A.A. Jarai, "Abelian Sandpiles: An Overview and Results on Certain Transitive Graphs". pp. 157-176: A. Ayyer, J.L. Lebowitz and E.R. Speer, "On Some Classes of Open Two-Species Exclusion Processes".