The purpose of this master thesis is to use marketing theory on the library?s activities. The marketing theory used is the 4Ps; product, price, promotion and place, as it's presented by Philip Kotler. Because the library can be seen as a service oriented organization Christian Gronroos theory of marketing in the service industry also has been used. A case study of the public library in Broby was made to illustrate how the public libraries? activities can appear in the light of marketing theory.