Silica aerogels are known as a unique class of highly porous materials prepared via liquid-phase processes and supercritical drying.Carefully prepared silica aerogels possess pore structures in the length scale of a few tens nanometers, which provides visible-light transparency and very low thermal conductivity.However, mechanical strength is considerably low due to the fine porous structure and high porosity.In order to extend applications of aerogels, mechanical properties such as strength and flexibility must be improved for easier handling and forming, as well as for more efficient productivity by avoiding supercritical drying at high pressure.Through our recent research on the improvement of mechanical properties by organic-inorganic hybridization strategies, the following important findings have been obtained.