Lud's Church (sometimes written as Ludchurch) is a deep chasm penetrating the Millstone Grit bedrock created by a massive landslip on the hillside above Gradbach, Staffordshire, England.

Lud's Church is formed within the thick bed of coarse Carboniferous sandstone known as the Roaches Grit which here dips northeastwards into the Goyt Syncline.

Scholars spent many decades debating the dialect of the medieval poem Sir Gawain and the Green Knight.

Shortly after they came to a consensus that the dialect was that of the North-West Midlands on the Staffordshire/Cheshire/Shropshire border, Lud’s Church in the Staffordshire Moorlands was suggested by R. W. V. Elliot as one of the key settings for the climax of the poem's story – "The Green Chapel" – in May 1958.

[6] His general claim that "The Green Chapel" must be somewhere in this district was supported by other scholarly work suggesting the location as Nan Tor cave, above the former railway station at Wetton Mill.