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There is a belief that sustainability-certified coffee production helps increase economic benefits to farmers and reduces negative environmental impacts. However, the international empirical evidence is not conclusive. Also, there is a lack of empirical evidence for Vietnam - the world's second-largest coffee producing country. This paper provides the first empirical examination of the differences in eco-efficiency between conventional and sustainability-certified coffee-growing farms in Vietnam. Data of 726 farms in Vietnam over three crop years from 2012/13 to 2014/15 are analysed. Environmental pressures measured by the level of consumption of nitrogen, phosphorus, irrigation water, pesticides, herbicides, fungicides, and land are investigated in relation to the value-added of coffee production. Empirical results show that in each crop year, coffee farms could reduce environmental pressures by more than 50 …