Abstarct: Tyab mangrove protected area and its adjacent coastal areas are at risk to environmental contaminations due to its close proximity to residential areas, the fishing and commercial ports and shrimp farming centers. The general aim of this research is to evaluate the concentrations of Total Petroleum Hydrocarbons (TPHs) and heavy mextals in surface sediments of Tyab and Kolahi as well as the adjacent mangroves. For this purpose, sediment samples were taken from 16 stations (in triplicate) along the coastline and mangrove habitats. Physico-chemical properties of sediments such as grain size, pH, Total Organic Matter (TOM) and Organic Carbon (OC) were measured using the standard methods. The concentrations of heavy mextals were also determined using ICP-OES and concentration of total petroleum hydrocarbons was determined by means of Ultraviolet Fluorescence Spectroscopy (UVF). mextal concentrations ranged from (in mgkg-1) 124-163 (for Ni), 73-89 (for V), 8-9 (for Pb), 48-68 (for Zn) and 112-136 (for Cr) in sediment samples and their mean concentrations (except for zinc) are all higher than those in the Persian Gulf sediments. Petroleum hydrocarbons showed a slightly variation ranging from 4.89-0.36 (µg/g) dry weight for the sampled sediments. The concentrations for total petroleum hydrocarbons were generally lower than the guideline values for environmental risks. Highest TPH concentrations are found in sediments from Tyab and Kolahi berth are due to pollution from fishing boats and other activities. Calculated enrichment factor (EF) and geo-accumulation index (Igeo) for heavy mextals showed that all mextals (except for nickel) in the sediments have low contamination degree. Enrichment factor (1.86) and geo-accumulation index (0.54) for nickel are higher than the other mextals suggesting that this mextal is most likely connected to hydrocarbon pollution in the study area. As well as environmental risk assessment of petroleum hydrocarbon contamination on aquatic organisms using indicators sediment quality guidelines (SQGs) and the contamination factor (CF) indicated that sediments except (in station No.1 (CF=1.22)) generally have no adverse biological effects on aquatic organisms. Finally, the results of multivariate statistical data showed that physico-chemical parameters of sediments (grain size, pH, organic matter and organic carbon), heavy mextals contents and total petroleum hydrocarbons have no mutual correlation and grouped in different clusters or components representing that there are probably different sources or controlling factors for these parameters in sediments.