Lord Castlereagh (disambiguation)
# Lord Castlereagh (disambiguation)

Lord Castlereagh may refer to:

* Lord Castlereagh (1769–1822), Anglo-Irish politician
* Marquess of Londonderry, courtesy title for heirs to the peerage
* Lord Castlereagh (painting), an 1809 portrait by Thomas Lawrence
* Lord Castlereagh (1802 ship), named after the politician
* Lord Castlereagh (1803 ship), named after the politician
