CityFibre is a British telecommunications infrastructure company that builds and operates gigabit-capable full fibre-to-the-premises (FTTP) broadband networks across the UK. It functions as an open-access wholesale provider, enabling over 30 retail broadband providers to deliver services to residential, business, and public sector customers. As the third-largest network provider after Openreach and Virgin Media, it focuses on expanding high-speed internet to underserved cities and towns.