Lancaster Cathedral, also known as The Cathedral Church of St Peter and Saint Peter's Cathedral, is a Roman Catholic cathedral in Lancaster, Lancashire, England.

It was a Roman Catholic parish church until 1924, when it was elevated to the status of a cathedral.

It started as a mission church in 1798, and the present church was built on a different site in 1857–1859. It was designed by E. G. Paley in the Gothic Revival style and is a Grade II listed building.

In 1901 a baptistry was added by Austin and Paley, and the east end was reordered in 1995 by Francis Roberts.