An important challenge to guarantee the successful operation of white space networks based on spectrum sharing, in a heterogeneous wireless network environment, is mitigation of interference. Interference mitigation (IM) is a term used to describe the techniques applied to minimize interference between networks operating in the same or adjacent spectrum hands. This paper will present a review of existing interference mitigation techniques with the aim of improving co-existence between spectrum sharing white space networks; it will also improve network quality of service. Furthermore, the paper will provide a detailed description of some of the recent IM techniques developed for TV white space networks, involving the geo-location spectrum database (GLSD) and reconfigurable radio devices.