~~~incomplete list~~~
traditionals      classics      stablemates

H
Haflinger
Halayi
Halla
Hank
Hanover
Hanoverian
Harmonie
Hatatitla
Hawk
Heartland
Heartland Equality
Henry
Hickock
Hickstead
High Flyer
Highland Clydesdale
High Sierra
Hightower
High Wire
Hidalgo (Andalusian Stallion)
Hidalgo (Arabian)
Hildago (Silver)
Hobo (Hobo)
Hobo (Phar Lap)
Hobo (Silver)
Holiday Hunt
Hollywood Dun It
Hollywood Gold
Hopalong Cassidy's Topper
Hope
Horse of a Different Color
Horsepower
Hot Shot
Huckleberry Bey
Hunter Pony
Hyksos

I
Ichilay
Ideal
Ideal American Quarter Horse
Illtschi
Illuminati
Impress Me Shannon
Inconspicuous
Indiana
Indian Pony
Irish Mist
Irish Warrior
Iron Metal Chief
Isham
Ivy League

J
Jack Frost
Jack of Clubs
Jade
Jake
JB Andrew
Jeremy
Jet Deck
Jet Run
Jim Key
Jingles (the Black Stallion)
Jingles (Misty)
Joe Bailey's King
Joe Patchen
Joey's Pony Cart
John Henry
Joker
Journey
Joy (Nursing Foal)
Joy (Family Arabian Foal)
Julian
Jumping Gem Twist
Jumping Horse
Just About Horses
Just Incredible
Justin Morgan (Justin Morgan)
Justin Morgan (Sherman Morgan)
Justin Morgan's Dam
Justin Morgan, A Young
Just Justin

K
Kaleidoscope
Kalico
Kamikaze
Karinthia
Karma Gypsy
Keen
Kelly Reno and Little Man
Keltic Salinero
Kelso
Kennebec Count
Kentuckiana
Kentucky Saddlebred
Khemosabi
King (Fighting Stallion)
King (Ideal American Quarter Horse)
King (Man O'War)
King of Diamonds
King of Hearts
Kiwi
Kokopelli's Gold
Kola
Korinth
Kris Kringle

L
Laag
Labyrinth
Laddie II
Lady Jane Grey Jefferson
Lady Liberty
Lady Phase
Lady Roxana
Lakota Pony
Lanark's Rosebud
Largo
Lark Ascending
Lavinia
Lavrador
Lazy Days Midnight
Leah's Fancy Breyer
Leah's Fancy Chick
Le Fire
Legally Blonde
Legionario III
Leo
Liberty
The Life Guards of the Queen's Household Cavalry
Lightning "Wakinyan"
Like a Diamond
Lipizzan
Lipizzan Stallion
Lippitt Pegasus
Little Andy Wind "Bo Diddley"
Little Bub
Little Chaparral
Little Man
Little Sorrel
Liver Chestnut Appaloosa Sporthorse
Liver Chestnut Paint
Llanarth True Briton
Lonesome Glory
Lone Star
LTD's Red Cloud
Lula
Luz De Luna
Lying Down Unicorn
Lying Foal