This list comprises of all of the villains seen in Codename: Kids Next Door.
Delightful Mansion From Down The Lane[]
Teenagers[]
- Cree Lincoln
- Chad Dickson
- Chuckie Cavallaro
- Jenna
- Piggy
- Stacey
- Lieutenant Seltzer
- Teen Tornado
- The Steve
Adult Supervillains[]
- Al Sugarh
- Bag-Headed Cashier
- Bucket-Headed Usher
- Cafe Employee
- Carny
- Chef Pierre
- Chester
- Chewy and Gooey
- Coach Wetterhahn
- Common Cold
- Count Spankulot
- Crazy Old Cat Lady
- Cuppa Joe
- Dodgeball Wizard
- Edna Jucation
- Farmer
- Frankie Flatfoot
- Gramma Stuffum
- Grandma Lydia
- Knightbrace
- Little Juan
- Madam Margaret
- Mega Mom & Destructo Dad
- Miss Goodwall
- Mother Of The Annoyingly Cute Triplets Who Lived Upon the Hill
- Mr. Boss
- Mr. Fizz
- Mr. Frybingle
- Mr. Mogul
- Mr. P
- Mr. Physically Fitastic
- Mr. Q
- Mr. W
- Mr. Wink & Mr. Fibb
- Mr. Washer
- Nogoodnik
- Nurse Claiborne
- Nurse Jumbo
- Potty Mouth
- Principal Sauerbraten
- Principal Smelling
- Professor Bob
- Professor Triple-Extra Large
- Rainbow Monkey Corporation Pilot
- Robin Food
- Soccer Mom
- Stickybeard
- The Big Idea
- The Great Puttinski
- The Iguana
- The Sheep Costume
- Toiletnator
- Truck Driver
- Unintelligible Tutor
Child Villains[]
- Annoyingly Cute Triplets Who Lived Upon the Hill
- Baby Jackson
- Delightfuloids
- Ernest
- Heinrich Von Marzipan
- Interesting Twins From Beneath The Mountain
- Jerry Rassic
- King Sandy
- Mandy (Crossover only)
- Margie
- Mushi Sanban
- Negative Numbuh 4
- Numbuh 12
- Numbuh 206
- Numbuh 48 Flavors
- President Jimmy
- Rowdy Hooligans From Across the Square
- The Big Badolescent
- Valerie
- Windsor
- Willard Wallace
Groups and Organizations[]
- Angry History Teachers
- Ankle-Biters
- Candy Pirates
- Cheese Ninjas
- Chicken Bucket Men
- Coffee Workers
- Couch Daves
- Faculty 4
- Father's Ninja Army
- Girl Squad
- Gramma Stuffum's Food Army
- Hall Squad
- Honor Roll Nerds
- Hungry Men
- Grown-up Gorilla Gang
- Ice Cream Men
- Knights of the Round Towel
- Licorice Pirates
- Nerd Zombies
- Parent Teacher Organization Of Eradicating Youngsters
- Preferred Villains Club
- Professors
- Retirement Home Secretary
- Senior Citizen Squad
- Senior Citi-zombies
- Six-Gum Gang
- Soda Control Team
- Soda, Snacks and Treats Commission
- Spank-Happy Vampire Army
- St. Rita's Preparatory School Staff
- Teen Ninja Army
- The Bullies
- The Proper Patrol
- Villains (bowling team)
Comic Book Villains[]
- Accountants
- Ancient evil adult sooper villain
- Barber
- Cowgirls
- Eric the Red-Eyed
- Long John Silverfilling
- Octosofa
- Staticky Stacey
- Sugar Daddy
- Tooth Fairy Force
- Toothy Larry
- Videogame Vikings
- Watchman
Imaginary[]
Other[]
- Amalgamation
- Abominable Snowsuit
- Big Brother
- Big Brother's Big Brother
- Black John Licorice
- Brussels Sprout
- Cheese Shogun Roquefort
- Chubbo
- Curse of King Two-Tons-of-Candy
- Delightful Reaper (crossover)
- Eddie
- Giant Turnip
- Great White Asparagus
- Hoagiemobile
- Ice Cream Monster
- Master Safety Bot
- Mr. B.
- Mutant Lice
- Pound Cake
- Principal Margaret
- Queen Tie
- RAMON-4
- Robot Crabs
- Safety Bots
- Salami Samurai
- Shark Family
- Sinister Felines From Atop The Litterbox
- Sir Toasty
- Slam Witch
- Spankenstine Monster
- Tacky belts
- The Human Text
- Thesaurus Rex
- Unintroduced Villains