One of the major challenges in the water sector is managing wastewater, particularly graywater (GW), which arises from household activities such as bathing, washing clothes, and dishes. This chapter explores the potential of GW systems as a water- and cost-saving technology within the hospitality industry or commercial buildings. GW refers to gently used wastewater from sources like bathroom sinks, showers, and washing machines, excluding toilets and kitchen sinks, due to potential hygiene concerns. The chapter highlights the benefits of GW systems for hotels, restaurants, and other commercial buildings. These include reduced freshwater consumption, reduced sewage disposal, cost savings, and environmental sustainability. The chapter outlines available GW systems, their treatment processes, and considerations for installation and maintenance in hospitality settings. Case studies of successful GW systems implemented in hotels, restaurants, and other commercial buildings are presented to demonstrate the practical applications of this technology. This chapter aims to encourage the adoption of GW management within the hospitality industry, contributing to a more sustainable future for both businesses and the environment.