Chitin extracted from white shrimp shell was investigated to study oil adsorption in wastewater. The optimum condition for deproteinization and deminieralization of white shrimp shell were refluxing with 8% w/v sodium hydroxide at 80^OC for 3 hours followed by storage in 8% w/v hydrochloric acid at ambient temperature (28^oC) for 24 hr. The physical appearance of the extracted chitin was light orange. The amount of chitin obtained was 5.73 % w/w of the total weight of the shrimp shell. Its application in oil adsorption using the synthetic wastewater containing 2% w/v oil with the optimum condition at 28 ^๐C, pH of 9.0 and 125 rpm shaking for 15 min was studied. It was observed that the extracted amounts of 1.00, 2.00, 3.00, 4.00 and 5.00 grams gave the oil adsorption efficiency of 65.25  76.10  78.33 79.13 and 80.25 %, respectively. The oil adsorption efficiency in five areas of wastewater in Rangsit University canteen showed a high efficiency with the average of 86.55%