The Old Castle's Secret
| Series | Walt Disney's Donald Duck |
| Number | Vol. 6 |
| Publisher | Fantagraphics Books, Inc. |
| Date | 2013 |
| Type | Comic Strips, Hardcover |
| Language | English |
| Artist | Carl Barks |
| Associate Editor | J. Michael Catron |
| Colorist | Rich Tommaso |
| Designer | Jacob Covey, Tony Ong |
| Editor | Gary Groth |
| Writer | Carl Barks |
| Genre | Anthropomorphic |
| Published in | Seattle, WA |
| Pages | 240 |
| ISBN | 978-1606996539 |
| Characters | Donald Duck, Scrooge McDuck, Huey, Dewey, Louie, Gladstone Gander, Daisy Duck |
| Story Location | Duckberg |
Added by theLackwit