Cockersand Abbey chapter house is a mausoleum in the English village of Thurnham, Lancashire.

A Grade I listed building and formerly part of Cockersand Abbey, it dates to 1230.

[1] It was used as a family mausoleum by the Daltons of Thurnham Hall during the 18th and 19th centuries.

The building is constructed of red sandstone rubble and has a slate roof.

At some point (probably the mid-18th century) it was converted into a family burial chamber.