As a fan of everything Disney and an owner of several Nintendo game systems I have often sought out Disney games to play on them.  Here is a list of the once I know of that are made for original Game Boy, Game Boy Color (GBC), Game Boy Advance (GBA), and Game Boy DS.  Many of these Disney games are great for young kids, but they can also be enjoyed by older kids and adults (like me) who are big Disney fans.

Disney games for Game Boy systems are a great way to entertain kids when traveling, especailly when traveling to a Disney park, and for when waiting in line at Disney parks.

Game Boy

Aladdin
Darkwing Duck
Ducktales
Ducktales 2
Hercules
Mickey Mouse Magic Wands
Mickey's Dangerous Chase
Mickey's Ultimate Challenge
Mulan
Pinocchio
Pocahontas
Tale Spin
Tarzan
The Adventures of Pinocchio
The Hunchback of Notre Dame
The Jungle Book
The Lion King
The Little Mermaid
Toy Story

Game Boy Color (GBC)

102 Dalmations
Aladdin
Alice in Wonderland
Atlantis: The Lost Empire
Buzz Lightyear of Star Command
Dinosaur
Donald Duck: Goin' Quackers
Magical Tetris Challenge
Mickey's Racing Adventure
Mickey's Speedway USA
Monsters, Inc
Pooh and Tigger's Honey Safari
Snow White and the Seven Dwarves
Tarzan
The Emperor's New Groove
The Jungle Book
The Lion King 2
The Little Mermaid 2: Pinball Frenzy
Toy Story 2
Toy Story Racer
Walt Disney World Quest: Magical Racing Tour

Game Boy Advance (GBA)

Aladdin
Atlantis: The Lost Empire
Chicken Little
Disney Princess
Disney Sports Basketball
Disney Sports Football
Disney Sports Motocross
Disney Sports Skateboarding
Disney Sports Snowboarding
Disney Sports Soccer
Disney's Extreme Skate Adventure

Disney's Magical Quest
Disney's Magical Quest 2: Starring Mickey & Minnie
Disney's Magical Quest 3: Starring Mickey & Donald
Donald Duck Advance
Finding Nemo
Finding Nemo: The Continuing Adventure
Herbie: Fully Loaded
Kim Possible: Revenge of Monket Fist
Kim Possible 2: Drakken's Demise
Kim Possible 3: Team Possible
Kingdom Hearts: Chain of Memories
Lizzie McGuire: On the Go
Lizzie McGuire 2: Lizzie Diaries
Lizzie McGuire 3: Homecoming Havoc
Monsters, Inc
Peter Pan: Return to Neverland
That's So Raven
That's So Raven 2: Supernatural Style
The Haunted Mansion
The Jungle Book
The Lion King 1 1/2
Winnie the Pooh's Rumbky Tumbly Adventure

Game Boy DS

Note: Some of these games have not been released yet, but have been announced.

American Dragon: Jake Long, Attack of the Dark Dragon
Cars

Chicken Little: Ace in Action
Finding Nemo: Escape to the Big Blue
Hannah Montana
Herbie
Kim Possible: Global Gemini
Kim Possible: Kimmunicator
Meet the Robinsons
Meteos: Disney Edition
Pirates of the Caribbean: Dead Man's Chest
The Incredible: Rise of the Underminer
The Little Mermaid: Ariel's Undersea Adventure
The Suite Life of Zack and Cody: Trouble at the Tipton