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Credit allocation through the usage of Portfolio optimization mainly seeks to maximize return and minimize the risk of the portfolio; but there are other important issues including sustainable development which is important for government/public sectors. This paper presents a novel credit allocation approach based on portfolio optimization and investigates the effects of selected indicators of sustainable development on credit allocation. In order to evaluate this case study, constraint mean-variance was used as the extension of Markowitz portfolio theory. Selected indicators were modeled as the mathematical model's objectives and constraints. In order to show the applicability of the model, experimental results were given based on credit allocation data for National Development Fund of Iran (NDFI). The results show that sustainable development selected indicators exacerbate the return of NDFI portfolio from one side and from the other side, its effect on NDFI risk is somewhat similar but lighter. [ABSTRACT FROM AUTHOR]