Inorganic nanoparticles with UV-absorbing properties are an important class of UV filters. They can be used in various applications and in a variety of forms, including suspensions, nanocomposites, and solid thin films. In this review, an overview of the synthetic methods and their respective products is given for the most popular UV-absorbing nanomaterials, including zinc oxide, titanium dioxide, cerium dioxide and ferrous oxides, and oxyhydroxides.