- Kelly-Ruth Mercier
- Ken Kramer
- Kendall Cross
- Kerry Sandomirsky
- Kerry van der Griend
- Kevin
- Kevin Blatch
- Kevin Derksen
- Key to the Vault of the Dark One
- Keys to the Land of Untold Stories
- Kiefer Bahrich
- King's Castle
- King's Guard (W.11)
- King (1.04)
- King Arthur
- King David
- King Fergus
- King Fergus' Gravestone
- King George
- King Harald
- King Leopold
- King Magnus
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- King Olaf
- King Poseidon
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- King Xavier
- King Xavier's Castle
- King of Arendelle
- Knave of Hearts
- Knight (1.06)
- Knight (3.03)
- Knightfall
- Knights of the Round Table
- Knubbin
- Knubbin's Cottage
- Kristin Bauer van Straten
- Kristoff
- Kronos
- Kurt Flynn
- Kwesi Ameyaw
- Kylee Bush
- Kylie Rogers
- Labor of Love
- Lacey
- Lady (OotP)
- Lady (W.05)
- Lady Tremaine
- Lady of the Lake
- Lake Nostos
- Lake Onondaga
- Lana Parrilla
- Lancelot
- Land Without Color
- Land Without Color Graveyard
- Land Without Magic
- Land of Untold Stories
- Land of Untold Stories Marketplace
- Landlord (4.19)
- Last Rites
- Laura Bertram
- Laura Wilson
- Lauren McKnight
- Layton Keely
- LeFou
- Lead Guard (3.17)
- Lead Knight (1.03)
- Leah Fong
- Leah Gibson
- Leaving Storybrooke
- Lee Arenberg
- Lee Majdoub
- Lee Page
- Lee Tichon
- Leif Havdale
- Lesley Nicol
- Lethe
- Leviathan
- Leviathan Shoals
- Lewis
- Liam Garrigan
- Liam Jones
- Liam Jones II
- Librarian (5.22)
- Lily's Squatter House
- Lily's Trailer
- Lily's baby rattle
- Lily's necklace
- Lily (episode)
- Lily Knight
- Lily Page
- Lindsay Collins
- Lip Curse
- Lisa Banes
- List of costumes
- List of deaths
- List of stories
- Little John
- Liz Tigelaar
- Lizard
- Lizard's Home
- Logan International Airport
- London
- Longbourne
- Looking Glasses
- Lord Dingwall
- Lord LeGume
- Lord MacGuffin
- Lord Macintosh
- Loretta
- Lost Boy (3.02)
- Lost Boy (3.09)
- Lost Boy 1
- Lost Boy 2
- Lost Boys
- Lost Girl
- Lost and Found
- Love Doesn't Stand a Chance
- Lowell
- Lowell Apartment Complex
- Lucas Wolf
- Lucy
- Luke Camilleri
- Luke Roessler
- Lumière
- Lydgate House
- Lydia
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