A basic premise of constitutional law is parliamentary sovereignty, which denotes that a nations legislative body has the absolute power to enact or amend laws. The notion of parliamentary sovereignty is examined in this examination along with its historical evolution and current applicability. It looks at whether parliamentary sovereignty is available in various constitutional systems, what obstacles it encounters in the face of globalisation and supranational government, and what effects it has when it is used. This research intends to provide insight on the availability and constraints of parliamentary sovereignty in contemporary government by examining case studies and legislative frameworks.