Ye Olde John O'Gaunt is a historic pub situated at 53 Market Street in Lancaster, UK. It has been serving patrons since 1871 and is named after John of Gaunt, Duke of Lancaster. The building features 15th-century foundations, lending it an authentic historic atmosphere. The pub is known for its live music events, including frequent open mic sessions, as well as its selection of real ales and traditional pub food, particularly noted for its pork dishes.