- On Desperate Ground
- On dirait que je vous ai manqué
- On Either Side: A World War Two Romance
- On Elizabeth Bishop
- On Empson
- On Essays
- On ets, Anastàsia?
- On Falcon's Wings
- On Folly Beach
- On Freedom
- On Gin Lane
- On Grounds of Honor
- On Hadrian's Secret Service
- On Henry Miller
- On Heroes, Hero-Worship, and the Heroic in History
- On His Blindness (Whitehall Season 1 Episode 3)
- On His Majesty's Service
- On Histories and Stories
- On Kipling’s Stories And Arnold’s Essays
- On l'appelait Caravaggino
- On l'appelait l'insubmersible...
- On Leopard Rock: A Life of Adventures
- On Liberty
- On Life-Writing
- On Mother Brown's Doorstep
- On ne badine pas avec l'amour d'Alfred de Musset
- On ne badine pas avec l'amour d'Alfred de Musset (Analyse de l'oeuvre)
- On ne badine pas avec l'amour - Alfred de Musset (Fiche de lecture)
- On ne badine pas avec l'amour de Musset - Acte III, scène 8
- On Nineteen Eighty-Four
- On Not Defending Poetry
- On nous regarde !
- On Picket Duty
- On Picket Duty, and Other Tales
- On Piedmont's Plot
- On Power
- On Psychological and Visionary Art
- On Raven's Wing
- On Roads Most Travelled: an Irish-Australian Historical Novel
- On Sympathy
- On són els llibres de Jaume I
- On The Alter Of England
- On the Art of War
- On the Banks of the Zambezi
- On the Beach
- On the Borderland
- On the Brink
- On the Duty of Civil Disobedience
- On the Edge of Darkness
- On the Enemy's Side
- On the Eve
- On The Eve of Conflict
- On the Face of the Waters - A Tale of Mutiny
- On the Field of Glory (Illustrated Edition)
- On the Field of Glory: An Historical Novel of the Time of King John Sobieski
- On the Great Plains
- On the Green Hill of Tara
- On the Head of a Pin
- On the Height
- On the High Road
- On the High Seas
- On the High Seas, an Irish Odyssey, Second in a Series
- On the Home Front
- On the Homefront
- On the Irrawaddy: A Story of the First Burmese War
- On The Makaloa Mat
- On the Other Side of the Sky
- On the Pampas
- On The Pampas The Young Settlers
- On the Plains of Kerreri
- On the Proper Use of Stars
- On The Ridge
- On the Road by Jack Kerouac (Book Analysis)
- On the Road from Burns
- On the Rope
- On the Ropes
- On the Shore
- On the Side of Good
- On the Soul
- On the Strength of Wings
- On the Track of the Sun – The Red Warriors from Chorasmia
- On the Wapiti Range
- On the Wings of Angels
- On the Wings of Eagles
- On The Wings Of Love
- On the Wings of the Wind
- On The Wings Of Time
- On This Foundation
- On This Night: A Civil War Mystery
- On to Chicago
- On Wheels
- On Whitman
- On Wings of Song
- On Wings of the Morning
- On Wings Of The Morning
- On Writers and Writing
- On Writing
- Once a Courtesan
- Once a Duchess
- Once a Midwife
- Once a Princess
- Once a Rake
- Once a Ranger
- Once A Rogue
- Once a Soldier
- Once Again
- Once Again Assembled Here
- Once Again, My Laird
- Once an Angel
- Once an Eagle
- Once Dishonored
- Once More Unto the Breach
- Once More, From the Beginning
- Once More, Miranda
- Once More, My Darling Rogue
- Once on a Moonless Night
- Once Upon a Blue Dot
- Once Upon a Christmas Eve
- Once Upon a Christmas Eve: A Maiden Lane Novella
- Once Upon a Highland Moon: A Scottish Historical Romance
- Once Upon a Moonlit Night: A Maiden Lane Novella
- Once Upon a Plaid
- Once Upon a River
- Once Upon a Scandal
- Once Upon a Summer (Seasons of the Heart Book #1)
- Once Upon A Tee: A Golf Story
- Once Upon A Time In Bharatha Desham
- Once Upon a Time in Brownsville
- Once Upon a Time in Hollywood
- Once Upon a Time, on Lesbos
- Once Upon a Tower
- Once Upon a Wardrobe
- Once Upon a Wedding Boxed Set (Books 5-7)
- Once We Loved
- Once We Were Here