Lincoln Cathedral, also called Lincoln Minster, and formally the Cathedral Church of the Blessed Virgin Mary of Lincoln, is a Church of England cathedral in Lincoln, England. It is the seat of the bishop of Lincoln and is the mother church of the diocese of Lincoln. The cathedral is governed by its dean and chapter, and is a grade I listed building.

The earliest parts of the current building date to 1072, when bishop Remigius de Fécamp moved his seat from Dorchester on Thames to Lincoln. The building was completed in 1092, but severely damaged in an earthquake in 1185. It was rebuilt over the following centuries in different phases of the Gothic style, with significant surviving parts of the cathedral in Early English, Decorated and Perpendicular.

The cathedral holds one of the four remaining copies of the original Magna Carta, which is now displayed in Lincoln Castle. It is the fourth largest cathedral in the UK by floor area, at approximately 5,000 m² (50,000 sq ft), after Liverpool Cathedral, St Paul's Cathedral, and York Minster. It is highly regarded by architectural scholars; the Victorian writer John Ruskin declared: "I have always held ... that the cathedral of Lincoln is out and out the most precious piece of architecture in the British Isles and roughly speaking worth any two other cathedrals we have."