Abstract: In this study, total lead (Pb), cadmium (Cd), chromium (Cr), copper (Cu), zinc (Zn), arsenic (As) andaluminum (Al) contents were investigated in surface sediments in order to determine the current pollution inGüllük Bay, which has dense population in summer, low population in winter, and a thermal power plant in thevicinity. For this purpose, surface sediments were collected from the bay seasonally in 2011 and 2012. Strong acid(HNO3+HF+HClO4) digestion was used for metal analysis after drying in a freeze-dryer. Total metal concentrationswere measured by atomic absorption spectrophotometer. The total metal contents changed between 1 and 209 µg/g;10 and 259 µg/g; 1 and 59 µg/g; 0.1 and 46 µg/g; <0.01 and 2.8 µg/g, <0.01 and 0.4 µg/g and 0.6% and 5.9% forPb, Zn, Cu, Cr, Cd, As and Al, respectively. Cu, Cr and As concentrations were lower than the background values,contrary to higher Pb, Cd and Zn contents in bay surface sediments during all sampling periods. These high metalvalues indicate the presence of anthropogenic (domestic and industrial) inputs via Sarıçay creek and both maritimetransport and tourism waste in Güllük Bay. As a result, it was found that population growth and human activitiesaffected metal contamination.