Hospitals are structures where the use of energy and resources that affect both the environment and human health are intense. In particular, the health sector accounts for about 25% of the total carbon emissions of the community by itself and produces large quantities of toxic, harmful substances and contaminated water. Thinking of bringing hospitals out of this situation and making them more beneficial to the environment and human health have provided the emergence of the green hospital concept. In other words, the green hospital has referred to hospitals that use less energy, produce less waste, use more recyclable materials and become healthier organisations on this count. As green hospitals become widespread throughout the world, knowing how hospitals meet the requirements for green hospital has led to the emergence of green hospital certification systems. These certification systems assess hospitals in various areas and score points and certify to hospitals at different levels according to their scores. Hospitals having these certifications gain better patient outcomes, patient / employee safety and satisfaction, cost savings and productivity increase. In this respect, this study will focus on BREEAM for Healthcare, LEED for Healthcare, and Australian Green Star certification systems that are the most commonly used green hospital certification systems worldwide.