Abstract The oil and detergent pollution was determined in coastal waters and sediments in Dardanelles at entrance, Gelibolu and Lapseki; at exit, Çanakkale. The max. level of oil pollution in sea water was 154.76 µg/L at the entrance and 76.30 µ/L at the exit in 1996; 429.54 µg/L and 539.10 µg/L respectively in 1997. In sediments 51.13 µg/g at the entrance and 338.76 µg/L at the exit in 1996 and 369.56 µg/L and 339.56 in 1997. In detergent pollution the max.level was 50.51 µg/L at the entrance and 61.84 at the exit in 1996 and 80.08 µg/L and 61.43 in 1997. The findings indicated that the coastal areas were more polluted than mid-points (shipping route) of Dardanelles and also Sea of Marmara in 1996.