Although the Iranian plateau has witnessed Paleolithic researches since the early twenty century, still little is known about the Paleolithic of Iran. There are several reasons for this situation and lack of scholarly enthusiasm on the part of Iranian archaeologists seems to be the most imperative one. Concerning the history of Paleolithic surveys and excavations conducted in Iran, three distinct phases are recognizable. First, from the beginning of the twenty century to the 1980 when numerous field missions were executed in this region all by western institutes, second phase observes a twenty years gap in the Paleolithic studies hence; only few surveys could be performed in this period, and the third phase starts with the reopening of the Iranian fields to the non-Iranian researchers, which led to the survey and excavation of handful of new Paleolithic sites. This article reviews Paleolithic researches conducted in Iran since the beginning of twenty century to the present time.