In accordance with Article 14 of 5510 Social Security and General Health Insurance Law, Occupational Disease has defined as “That the insured suffers temporary or permanent illness is physical or mental disabilities, due to the nature of the work or his work as a repeating reason or because of the conditions of work execution. According to No. 6331 Occupational Health and Safety Law, Occupational disease is defined as the diseases resulting from exposure to occupational risk.International Labour Organization has defined occupational disease in the Protocol of 2002 to the Occupational Safety and Health Convention, 1981 (No. 155) as “covers any disease contracted as a result of an exposure to risk factors arising from work activity”.Occupational diseases are divided into four groups including caused by Chemical agents, Physical agents, Biological agents and psycho-social agents. Chemical originated occupational diseases are classified into three groups as Heavy metal originated, aliphatic-aromatic compound originated and gas originated occupational diseases. In the present study, Chemical Originated Occupational Diseases, the distribution by sector of these diseases, changes according to age and years were examined on the basis of Social Security Administration data in Çorum the last five years.