Transverse Charge Densities Gerald Miller University of Washington Electromagnetic form factors have long been used to probe the underlying charge and magnetization densities of hadrons and nuclei. However,traditional three-dimensional Fourier transform methods are not applicable for systems with constituents that move relativistically. The use of the transverse charge density is a new, rigorously defined way to analyze electromagnetic form factors of hadrons. This talk will discuss the following issues: what is a transverse charge density; how is one extracted one from experiments; the existing results for the nucleon and pion; what is the relationship with other observable quantities such as the proton Zemach radius and the shape of the proton; and, future prospects.