Abstract: Throughout the history, language of signs and symbols was a sort of common explanation between cultures and religions. It is the language of signs and symbols which connects different cultures in various regions of the world to each other. Iranian pure culture which is among greatest and oldest civilizations of the world, has been expressed through plenty of symbolic concepts. Therefore, Iranian art is a symbolic one. The study of symbols, especially those ones which had durations in art works and literary books of scholars and in poems of poets through many centuries, helps us to know about the aspects and elegances of our national culture and history. This research studies the dragon symbol and corresponding concepts in Iranian culture. It analyses this symbol in ancient Iranian art and literary works and post Islam area. It also studies this symbol in lexicons, Avesta, Shahnameh and Holly Quran. It seeks to find the answers for these questions: Does dragon have old records in the art and culture of this land? What meanings did the dragon symbol have in Iranian art and culture? Findings indicated that dragon symbol was among old symbols of antique area and it had durations in Iranian art and art works of post-Islam. From a conceptual and symbolic view, dragon had a devilish and diabolical concept and was known as a destructive force. The results indicated that in Iranian cultural, artistic and literary works dragon was a negative symbol and was standing against common people.