- Colors
- ?
- Letters
- typeset
Table of contents on the inside front cover.
- Script
- Amanda Conner (credited); Jimmy Palmiotti (credited)
- Pencils
- Chad Hardin (credited)
- Inks
- Chad Hardin (credited)
- Colors
- Alex Sinclair (credited)
- Letters
- Dave Sharpe (credited)
- Genre
- superhero
- Characters
- Harley Quinn; Red Tool; Nathan the Dachshund; Bernie the Beaver; The Eraser [Leonard Fiasco]; Batman [Bruce Wayne]; Alfred Pennyworth
- Synopsis
- Feeling that she owes him a favor, Harley helps Alfred stop a robbery at Wayne Manor.
- Script
- Rafael Scavone (credited)
- Pencils
- Rafael Albuquerque (credited)
- Inks
- Rafael Albuquerque (credited)
- Colors
- Marcelo Maiolo (credited)
- Letters
- Josh Reed (credited)
- Genre
- superhero
- Characters
- Harley Quinn; Fifteen Minutes Man; Amanda Waller (voice only)
- Synopsis
- Amanda Waller send Harley and the Fifteen Minutes Man on a mission, but they have to change plans to save the lives of endangered kids.
- Pencils
- Amanda Conner (credited) (signed as )
- Inks
- Amanda Conner (credited) (signed as )
- Colors
- Alex Sinclair (credited) (signed as )
- Letters
- typeset
- Genre
- superhero
- Characters
- Harley Quinn [Harleen Quinzel]
Color art from the Amanda Conner & Alex Sinclair Variant Cover of this issue.
The main cover of this issue by Amanda Conner and Alex Sinclair depicts Harley with a birthday cake with sticks of dynamite for candles that is about to explode. This cover depicts what happened after the cake explodes.
- Pencils
- Stjepan Šejić (credited)
- Inks
- Stjepan Šejić (credited)
- Colors
- Stjepan Šejić (credited)
- Letters
- typeset
- Genre
- superhero
- Characters
- Harley Quinn [Harleen Quinzel]; The Joker
Color art from the Stjepan Šejić Variant Cover of this issue.
- Script
- Stjepan Šejić (credited)
- Pencils
- Stjepan Šejić (credited)
- Inks
- Stjepan Šejić (credited)
- Colors
- Stjepan Šejić (credited)
- Letters
- Pat Brosseau (credited)
- Genre
- superhero
- Characters
- Harley Quinn; The Penguin [Oswald Cobblepot]; Catwoman [Selina Kyle]; Poison Ivy [Pamela Isley];
- Synopsis
- Catwoman and Poison Ivy try to help Harley deal with her submissive nature.
- Script
- Stephanie Phillips (credited)
- Pencils
- Riley Rossmo (credited)
- Inks
- Riley Rossmo (credited)
- Colors
- Ivan Plascencia (credited)
- Letters
- AndWorld Design (credited)
- Genre
- superhero
- Characters
- Harley Quinn; Kevin; Bud the Hyena; Lou the Hyena
- Synopsis
- Harley and Kevin go to an animal preserve to try to find Bud and Lou.
- Reprints
Storyline continues in Harley Quinn (DC, 2021 series) #22.
- Pencils
- Artgerm (credited as Stanley "Artgerm" Lau) (signed as )
- Inks
- Artgerm (credited as Stanley "Artgerm" Lau) (signed as )
- Colors
- Artgerm (credited as Stanley "Artgerm" Lau) (signed as )
- Letters
- typeset
- Genre
- superhero
- Characters
- Harley Quinn [Harleen Quinzel]; Poison Ivy [Pamela Isley]; Batgirl [Barbara Gordon]
Color art from the Stanley "Artgerm" Lau Variant Cover of this issue.
- Script
- Kami Garcia (credited)
- Pencils
- Mico Suayan (credited); Jason Badower (credited)
- Inks
- Mico Suayan (credited); Jason Badower (credited)
- Colors
- Annette Kwok (credited)
- Letters
- Richard Starkings (credited); Tyler Smith of Comicraft (credited as Comicraft's Tyler Smith)
- Genre
- superhero
- Characters
- Harley Quinn [Harleen Quinzel]; James Gordon; Poison Ivy [Pamela Isley]; Edie (photo)
- Synopsis
- GCPD investigates some new Joker-style murders, but Harley doesn't believe the Joker is responsible.
Tie-in to the Joker / Harley: Criminal Sanity series.
- Script
- Paul Dini (credited)
- Pencils
- Guillem March (credited)
- Inks
- Guillem March (credited)
- Colors
- Tomeu Morey (credited)
- Letters
- Tom Napolitano (credited)
- Genre
- superhero
- Characters
- Harley Quinn; Catwoman [Selina Kyle]; Poison Ivy [Pamela Isley]; Orca [Grace Balin]; Roxy Rocket; March Harriet [Harriet Pratt]; Batgirl [Barbara Gordon]; Wonder Woman [Diana of Themyscira]; Giganta [Doris Zuel]; Livewire [Leslie Willis]; Tarantula [Catalina Flores]; Marionette [Erika Manson]; White Rabbit [Jaina Hudson]; Killer Frost [Caitlin Snow]; Katana [Tatsu Yamashiro]; Gaggy [Gagsworth A. Gagsworthy]; Baby Doll [Mary Louise Dahl]; Star Sapphire [Carol Ferris]; Magpie [Margaret Pye]
- Synopsis
- Selina and Pamela reluctantly agree to let Harley throw a housewarming party and invite a "few" friends, but they soon come to regret their decision.
- Pencils
- Bruce Timm (credited) (signed as )
- Inks
- Bruce Timm (credited) (signed as )
- Colors
- Bruce Timm (credited) (signed as )
- Letters
- typeset
- Genre
- superhero
- Characters
- Harley Quinn [Harleen Quinzel]
Color art from the Bruce Timm Variant Cover of this issue.
- Pencils
- J. Scott Campbell (credited) (signed as )
- Inks
- J. Scott Campbell (credited) (signed as )
- Colors
- Sabine Rich (credited) (signed as )
- Letters
- typeset
- Genre
- superhero
- Characters
- Harley Quinn [Harleen Quinzel]; Batman [Bruce Wayne]; The Joker
Color art from the J. Scott Campbell & Sabine Rich Variant Cover of this issue.
- Script
- Sam Humphries (credited)
- Pencils
- Erica Henderson (credited)
- Inks
- Erica Henderson (credited)
- Colors
- Erica Henderson (credited)
- Letters
- Dave Sharpe (credited)
- Genre
- superhero
- Characters
- Harley Quinn
- Synopsis
- In a medieval world, Harley is a jester who goes on a quest to find a lost castle and jewels so she can buy her first sword.
- Script
- Rob Williams (credited)
- Pencils
- John Timms (credited)
- Inks
- John Timms (credited)
- Colors
- John Timms (credited)
- Letters
- Saida Temofonte (credited)
- Genre
- superhero
- Characters
- Harley Quinn; Amanda Waller; Batman [Bruce Wayne]; Wonder Woman [Diana of Themyscira]; Superman [Clark Kent]; Bizarro; Suicide Squad [Captain Boomerang [George "Digger" Harkness]; Deadshot [Floyd Lawton]; Enchantress [June Moone]; Katana [Tatsu Yamashiro]; Killer Croc [Waylon Jones]]
- Synopsis
- When Amanda Waller is able to use technology to implant a brain bomb into the entire world's population, all criminal activity stops for fear of their brain bomb going off. Harley is the last who dares to defy Waller and continues to commit crimes.
- Script
- Cecil Castellucci (credited)
- Pencils
- Dan Hipp (credited)
- Inks
- Dan Hipp (credited)
- Colors
- Dan Hipp (credited)
- Letters
- Clayton Cowles (credited)
- Genre
- superhero
- Characters
- Harley Quinn
- Synopsis
- Harley needs to perform a community service to join an exclusive women's club, so she becomes a troop leader for a youth group.
- Pencils
- Jerome Opeña (credited)
- Inks
- Jerome Opeña (credited)
- Colors
- Tomeu Morey (credited)
- Letters
- typeset
- Genre
- superhero
- Characters
- Harley Quinn [Harleen Quinzel]; Captain Boomerang [George "Digger" Harkness]; Deadshot [Floyd Lawton]; Killer Croc [Waylon Jones]
Color art from the Jerome Opeña & Tomeu Morey Variant Cover of this issue.
- Pencils
- Terry Dodson (credited) (signed as )
- Inks
- Rachel Dodson (credited) (signed as )
- Colors
- Terry Dodson (credited) (signed as )
- Letters
- typeset
- Genre
- superhero
- Characters
- Harley Quinn [Harleen Quinzel]
- Keywords
- merry-go-round
Color art from the Terry Dodson & Rachel Dodson Variant Cover of this issue.
- Script
- Mindy Lee (credited); Terry Dodson (credited)
- Pencils
- Terry Dodson (credited)
- Inks
- Rachel Dodson (credited)
- Colors
- Terry Dodson (credited)
- Letters
- Clayton Cowles (credited)
- Genre
- superhero
- Characters
- Harley Quinn; Batman [Bruce Wayne]; The Joker; Poison Ivy [Pamela Isley]
- Synopsis
- In Harley's mind, Gotham is her world.
- Keywords
- roller skates
- Pencils
- Adam Hughes (credited) (signed as )
- Inks
- Adam Hughes (credited) (signed as )
- Colors
- Adam Hughes (credited) (signed as )
- Letters
- typeset
- Genre
- superhero
- Characters
- Harley Quinn [Harleen Quinzel]
Color art from the Adam Hughes Variant Cover of this issue.
- Pencils
- Lee Bermejo (credited)
- Inks
- Lee Bermejo (credited)
- Colors
- Lee Bermejo (credited)
- Letters
- typeset
- Genre
- superhero
- Characters
- Harley Quinn [Harleen Quinzel]
Color art from the Lee Bermejo Variant Cover of this issue.
- Colors
- ?
- Letters
- ?
Back cover featuring an enlarged Harley Quinn 30th Anniversary logo.