The concentration of fluoride in the bottled drinking water purchased from Riyadh supermarkets was found to vary between 0.50 and 0.83 mg/L fluoride. These results were different from earlier studies that reported a wider range of fluoride content in the water samples evaluated in Saudi Arabia but they were in agreement with Al-Oud who reported that the fluoride concentration of 24 locally produced bottled water samples investigated falls exclusively within the range of 0.6-1 mg/L. Although the reported range of fluoride content in the locally produced brands by Khan and Chohan was wider, the means of the present study and their study were comparable. In their study, Khan and Chohan have analyzed 21 different brands that were collected from Riyadh in year 2004, and only one batch was tested. None of the imported brands has fluoride concentration below 0.6 mg/L, and only one out of the 12 local brands tested had fluoride content below that level. In addition, this study reported a narrow range in the fluoride concentration within the same brand in different batches with an exception of one sample. These results disagree with earlier studies that reported significant differences in fluoride concentrations between the batches of water products ride concentration between the batches of water products. It has been shown that the fluoride content of water depends on weather