Symposium NN, "Electronic Organic and Inorganic Hybrid NanomaterialsSynthesis, Device Physics and Their Applications," was held April 2529 at the 2011 MRS Spring Meeting in San Francisco, California. The possibility of combining properties of organic and inorganic components in a unique hybrid composite material creates many potential applications. The combination at the nanosize level of inorganic and organic, or even bioactive components, in a single material has made accessible an immense new area of materials science that has extraordinary implications in the development of multifunctional materials. The promising applications are expected in many fields, including display, thin film transistors, electronic memory and switching devices, photonics, sensors and biological applications. This volume is a collection of 26 excellent papers from the proceedings.