In this book, it was aimed to determine some heavy metal content in black olives cv. Gemlik, which meet an important part of black table olive demand in our country and are of importance in our region. In the research, the iron, copper, zinc, lead and cadmium content of fresh olives grown at the roadside and on mountains were analyzed and the chemical and metal analyses were carried out on olives harvested from different sites when fresh, in the 1st, 3rd and 5th months of fermentation, or during the marketing period. Moreover, analyses of magnesium, chromium, cobalt, nickel and tin were realized in addition to the metals mentioned, with the aim of determining the metal content of black olives sold in the Bursa market. According to the results obtained from the study, the effects of all three regions on the metal pollution of olives picked from roadsides and near industrial zones were found to be significant statistically.