- Ugly (younger readers)
- UI 101
- Ulvekongen
- Um elefante na sala
- Uma história de verão
- Umbra
- Umbrella Summer
- Un any fora de casa! (Sèrie New York Academy 1)
- Un beso en tu futuro
- Un buco nel cielo
- Un Canto di Natale - A Christmas Carol (Edizione originale con le splendide illustrazioni di Arthur ...
- Un chien pour toujours
- Un dragón con suerte
- Un grosso equivoco
- Un infierno
- Un monstruo viene a verme
- Un Planeta Llamado Ratier/ a Planet Called Thear
- Un séjour inopiné
- Una casa a la deriva
- Una semana de siete lunes
- Una serata come le altre
- Una volta ho toccato il cielo
- Unbroken
- Uncle Tom's Cabin (Illustrated)
- Unclouded Day
- Undead Girl Gang
- Under Copp's Hill
- Under Locker and Key
- Under the Arches
- Under the Bottle Bridge
- Under the Influence
- Under the Same Sky
- Under the Watsons' Porch
- Undiscovered Country
- Une arme dans la tête
- Une chanteuse à Médine et autres contes arabes
- Une croisière mouvementée
- Une rivale à l'horizon
- Unfiltered
- Unfollow
- Unfriended
- Unfriendly Competition
- Ungerecht!
- Unintended Rebel
- Uninvited
- Union of Damaron
- Uninvited
- Union of Damaron
- Unleashed
- Unlocking the Future's Past: Book One
- Unmasked
- Unraveling Isobel
- Unsettled
- Unshakable Hope Promise Book
- Unsichtbare Wunden
- Unsolved Case Files: Escape at 10,000 Feet
- Unsung Heroes: Risk Takers
- Unter dem Himmel Australiens
- Until I Find Julian
- Until I’m Safe
- Un’Mei
- Up and Down the Scratchy Mountains
- Up from Jericho Tel
- Upgrade U
- Uprooted
- Uprooted: A New Life in the Arizona Sun
- Uptown Dreams
- Urban Hunters Box Set (Books 1-8)