Hailes Castle is a mainly 14th century castle about a mile and a half south west of East Linton, East Lothian, Scotland. This castle, which has a fine riverside setting, belonged to the Hepburn family during the most important centuries of its existence. It has been owned by the state since 1926, and it is administered by Historic Scotland. It is open to the public without charge at all reasonable times.

Sieges
The castle stands on a promontory on the Scottish river Tyne, blocking its strategic route, and preying on the route to Edinburgh. Within the 13th century curtain wall is the fourteenth century keep, to which ranges were added in the next two centuries. The major remaining works is the West Tower, a square donjon, which dwarfs the remains of the central tower that the Gourlays built, probably a rebuilding on the sixteenth century. Fifteenth century work includes a roofless chamber in which the remains of what appear to be an ambry and a piscina suggest it was a chapel rather than a hall. There is also a vaulted basement bakehouse and brewhouse from this period. The original tower was used as a dovecot after is ceased to be occupied. Of the East Tower only a finger of stonework remains.