- Under a Painted Sky
- Under a Purple Moon
- Under a Starlit Sky
- Under Alex's Bed
- Under Amelia's Wing
- Under an Apricot Moon
- Under Control
- Under dansk flag
- Under Drake's Flag
- Under Emily's Sky
- Under en himmel av glas
- Under Falling Skies
- Under Hill (Aos Si, #2)
- Under His Bed
- Under His Spell
- Under His Spell (Enhanced Edition)
- Under Jupiter
- Under kometens hale
- Under Locker and Key
- Under My Hat
- Under Plum Lake
- Under Pressure
- Under Pressure (Enhanced Edition)
- Under Pressure With a Squash
- Under Suspicion: A Friday Barnes Mystery
- Under the African Sky
- Under the Arches
- Under the Bed Fred
- Under the Bottle Bridge
- Under the Chilian Flag
- Under the Dusty Moon
- Under the Egg
- Under the Ghost Gum Tree
- Under the Green Hill
- Under The Light Of A Full Moon
- Under the Lilacs
- Under the Mermaid Angel
- Under the Milky Way
- Under the Moon
- Under The Moon
- Under the Moon Bundle
- Under the Moonlit Sky
- Under the Mountain Boxed Set: Books 1-3
- Under the Neon Glow
- Under the Persimmon Tree
- Under the Purple Sky
- Under the Rose Apple Tree
- Under the Rubble
- Under the Same Sky
- Under the Screaming Sky
- Under the Screaming Sky Book 1 Red Dragons
- Under the Sea
- Under the Sea With Addie
- Under the Shadow's Eye
- Under the Stars
- Under The Stars Of Faerie (Monkey Queen Book Three)
- Under the Summer Sun
- Under the Tracks
- Under the Volcano
- Under the Water
- Under the Watsons' Porch
- Under the Waves
- Under the Zaboca Tree
- Under Their Skin
- Under trottoaren
- Under Western Eyes
- Under Wildwood
- Undercover Fan
- Undercover Princess
- Undercover Revenge
- Undercover Tailback
- Undercover Witch Academy: First Year
- Undercover Witch Academy: Second Year
- Undercover Witch Academy: Third Year
- Underdawgs
- Underdog
- Underground To Canada
- Underland
- Underlife - Lecture roman ado science-fiction dystopie - Dès 13 ans
- Underlondon - Tome 1
- Underlondon - Tome 2
- Underlord
- Underminity
- Underneath the Surface
- Underpants are Awesome! Three Pants-tastic Books in One!
- Undersea, 2, 3 With Buster and Friends. Numbers for Counting
- Undersea, 4, 5 with Buster and Friends. Numbers for Counting
- Undersea, 6, 7 With Buster and Friends. Numbers for Counting
- Understanding Life Below the Beautiful Sea Children's Fish & Marine Life
- Understanding Me
- The Undertakers: Queen of the Dead
- The Undertakers: Rise of the Corpses
- Undertale: Diary of a Wimpy Human
- Undertale: Diary of Frisk in Snowdin Forest - Through the Forest Part 2
- Undertow: Death's Twilight
- Undervannsgåten