[en] [Gutenberg 4610] • The Letters of Horace Walpole, Earl of Orford — Volume 2 Wentworth Press
[en] [Gutenberg 4609] • The Letters of Horace Walpole, Earl of Orford — Volume 1 Wallachia Publishers
[en] Delphi Complete Works of Horace Walpole Delphi Classics
[en] Delphi Complete Works of Horace Walpole (Illustrated) Delphi Classics
[en] Delphi Complete Works of Horace Walpole Delphi Classics
[de] Die Burg von Otranto CreateSpace Independent Publishing Platform
[de] Das Schless Otranto · Schauerroman Beck, C.H. Verlag
[fr] Le Chateau D'Otrante José Corti
[de] Das Schloss von Otranto Jazzybee Verlag
[tr] Otranto Şatosu Oxford University Press
[de] Das Schloss Von Otranto Oxford University Press
[pt] O Castelo De Otranto Escotilha
[es] El Castillo De Otranto Editorial Castalia