The combined UV and optical spectrum of the Seyfert type 2 galaxy NGC 3393 is presented and analyzed together with published IR and IRAS data. The conditions in the narrow-line gas strongly suggest that the high-ionization material is in a zone of higher density (Ne = 100,000/cu cm) while the low-ionization material is at Ne = 1000/cu cm. No evidence is found for internal reddening. Most of the optical and NIR flux is of stellar origin, and the IRAS fluxes can be adequately described by dust emission with two components at temperatures of about 30 K and 130 K, respectively. This dust would probably be located in the regions surrounding the Seyfert nucleus. The flux distribution of the nonstellar component can be fitted by a power law with index alpha = -0.60. This power law is closer to that observed in quasars and Seyfert type 1 galaxies than to the commonly derived for Seyfert types 2 (alpha = -1.5).