This year's VizSec Symposium will be held at Carnegie Mellon University, Pittsburgh, PA, USA on 20 July 2011. VizSec brings researchers and practioners from academia, government, and industry to share insights and present solutions to modern cyber security challenges using visualization techniques. Technical papers, speakers, and presentations will be featured in this year's program. If you are conducting research into security visualization please consider submitting a research paper (due by 1 April 2011) or a panel proposal (due by 15 April 2011).