PurposeThis study aims to extensively investigate the efficiency of real estate investment trusts (REITs) in Saudi Arabia.Design/methodology/approachThe study employs the data envelopment analysis on 17 Saudi REITs with an innovative profit-oriented approach in selecting REITs' inputs and outputs.FindingsIt is found that the traditional approach underestimates the efficiency of Saudi REITs in comparison with the profit-oriented approach, implying that relying on the traditional approach in assessing the efficiency of REITs will underestimate their efficiency and provide misleading results about their actual performance. However, both approaches showed that Saudi REITs are very efficient in utilizing their inputs, and the major source of their inefficiency is related to their scale inefficiency. Moreover, small Saudi REITs are more efficient than large ones. Finally, a higher level of debt is supposedly associated with lower levels of efficiency, indicating that Saudi REITs should not rely on debt funding because there is no tax advantage from using debt.Originality/valueThis paper has several contributions to the literature. First, it employs an innovative profit-oriented approach in selecting REITs' inputs and outputs. Second, this study focuses on analyzing the efficiency of REITs in Saudi Arabia, which is the largest country in the Middle East region, regarding size, stock market capitalization and gross domestic product. Finally, to the best of the author's knowledge, this is the first study to investigate the efficiency of REITs in Saudi Arabia, and it provides substantial information for REITs' investors and managers about the current efficiency of the Saudi REITs industry.