Solar energy occupies one of the most important places among the various possible alternative energy sources. In the design and study of solar energy, information on solar radiation and its components at a given location is very essential. In other words, a reasonably accurate knowledge of the availability of the solar resource at any place is required by solar engineers, architects, agriculturists, and hydrologists in many applications of solar energy such as solar furnaces, concentrating collectors, and interior illumination of buildings. For this purpose, in the past, several empirical correlations have been developed in order to estimate the solar radiation around the world. The main objective of the present study is to review solar radiation models available in the literature for both Turkey in general and some of the provinces. In this regard, a total of 41 models developed between 1983-2002 was given. Of this, 15 models were for the whole of Turkey, while the remainder were for some of Turkey's provinces such as Antalya, Elazig, Gebze, Istanbul, Izmir Konya and Trabzon. It may be concluded that the models investigated predict the solar radiation reasonably well for the projections.