Introduction. Institutional Sustainability and Sustainable Development are two concepts very often used together. Their meanings are blurring and versatile.
Aim of the study. This paper aims to define each concept distinctly and to identify their similarities, if any. To achieve these objectives, I will use the method of logical definition of a concept. Firstly I will identify the sufficiency predicates for Sustainable Development. Secondly I will define the concept of Sustainability. Thirdly, I will use sufficiency attributes to define the concept of Institutional Sustainability.
Keywords: sustainability; institutional sustainability, sustainable development, relationship institutional sustainability-sustainable development
JEL Classification: F49, O43, R11