Vietnamese Good Agricultural Practice (VietGAP) has been introduced in many provinces in the Mekong Delta, Vietnam to enhance the competitive advantage to fruit growers, including Idor longan (Dimocarpus longan Lour.) growers, to explore the stricter domestic and export markets and increase the income of the fruit growers in the Mekong Delta, Vietnam. This article presents a case study on the impacts of adopting VietGAP on the income of fruit growers (Idor longan) in the Mekong Delta by applying both T-test and Propensity Score Matching of 180 VietGAP and non-VietGAP adopters. The results show that applying VietGAP can reduce production cost, increase revenue, and profit to fruit growers. This is evidence to prove the benefits of adopting VietGAP and encourage the expansion of VietGAP to many fruits and other agricultural sectors in Vietnam.