In each tankōbon of JoJo's Bizarre Adventure, the front flap of the dust jacket typically features a photo of Hirohiko Araki and, more often than not, a personal note from him to the reader. Referred to as Author's Comments (作者コメント, Sakusha Komento), these notes provide Araki with a space to share his thoughts on a variety of topics, ranging from insights into JoJo's characters and story to anecdotes about recent events in his life. Shorter variations of these Araki comments can be found in the table of contents of every issue of Weekly Shonen Jump or Ultra Jump that a chapter of JoJo's Bizarre Adventure is featured in.

These notes are excluded in all subsequent releases, including digital releases. VIZ Media's original English release of Part 3 included each author's note on the first page of the corresponding volume; in the hardcover releases of Part 4 onward, the notes from each compiled tankōbon are instead provided on the final page of the volume.
The Author's Notes below are split up into the respective Parts each tankōbon belongs to:
- Author's Note, Phantom Blood
- Author's Note, Battle Tendency
- Author's Note, Stardust Crusaders
- Author's Note, Diamond is Unbreakable
- Author's Note, Vento Aureo
- Author's Note, Stone Ocean
- Author's Note, Steel Ball Run
- Author's Note, JoJolion
- Author's Note, The JOJOLands
- Author's Note, Thus Spoke Kishibe Rohan
- Author's Note, Other Works