- Official name: Collegiate Church of Saint Peter at Westminster
- Location/Address: 20 Deans Yd, London SW1P 3PA, United Kingdom
- Date of opening: 1090s (consecrated in 1065)
- Timings: 9:30am to 3:30pm (Monday to Friday) and 9am to 3pm on Saturday
- Architect: Henry of Reyns (principal architect for the 1245 rebuild under Henry III)
- Architectural style: Gothic
- UNESCO World Heritage Site: 1987
- Number of visitors per year: Around 1.6 million
- Function: Active church and royal ceremonial site