| O Pretends to be B For The Violent Admiral | Web Novel | chinese | 4.4 |
| O-Ri-Ga-Mi | Light Novel | japanese | 3.6 |
| O.V.E.R.L.O.A.D One Day… I Am a Villainess | Web Novel | thai | 4.1 |
| Oasis | Web Novel | chinese | 3.2 |
| Obaachan (28) is Free | Web Novel | japanese | 2.9 |
| Obedient Pregnancy | Web Novel | korean | 3.4 |
| Obey Me | Web Novel | korean | 4.0 |
| Obituary | Web Novel | korean | 3.1 |
| Obligation of an Arranged Marriage | Web Novel | korean | 3.7 |
| Obscene | Web Novel | chinese | 3.1 |
| Obscene Immortal | Web Novel | chinese | 4.2 |
| Observation Record of a Self-proclaimed Villainess’ Fiance | Web Novel | japanese | 4.6 |
| Obsessed by My Husband’s Loyal Dog | Web Novel | korean | 4.1 |
| Obsessed with Regressors | Web Novel | korean | 3.1 |
| Obsession | Web Novel | chinese | 3.5 |
| Obsession | Web Novel | korean | 2.7 |
| Obsession (Nanashi) | Web Novel | japanese | 2.3 |
| Obsession of the Neglected 6-Star Heroes | Web Novel | korean | 2.6 |
| Obsession… What’s That? I Just Wish Someone Would Help Me Escape | Web Novel | korean | 3.8 |
| Obtaining the Strongest Cheat | Web Novel | japanese | 2.6 |
| Obviously, He Has a Crush on Me | Web Novel | chinese | 3.1 |
| Obviously, It’s My Child | Web Novel | korean | 3.7 |
| Occupation: Adventurer; Race: Various | Web Novel | japanese | 2.5 |
| Oda Nobuna no Yabou | Light Novel | japanese | 4.2 |
| Odalisque | Web Novel | korean | 3.7 |
| Ode to Longevity | Published Novel | chinese | 2.6 |
| Odoacer | Web Novel | japanese | --- |
| Of All Things, I Became a Crow | Web Novel | korean | 3.8 |
| Of All the Transmigrations, Why Am I a Prisoner? | Web Novel | chinese | 3.9 |
| Of Course, It’s What a Maid Would Do. — The Falsely Accused, All-Purpose Maid Sets Off On a Journey | Web Novel | japanese | 3.8 |
| Of Course, I’ll Claim Palimony! | Web Novel | japanese | 4.2 |
| Of Mountains and Rivers | Web Novel | chinese | 4.0 |
| Off Air ~Yes, No, or Maybe Half?~ | Light Novel | japanese | 4.5 |
| Off Work, Then I Become a Magical Girl | Web Novel | chinese | 4.3 |
| Offer a Tribute and Become an Archmage | Web Novel | korean | 3.9 |
| Offered Into Marriage | Web Novel | chinese | 4.2 |
| Offering My Body for a Dragon | Web Novel | chinese | 3.5 |
| Offering Salted Fish To Master | Web Novel | chinese | 4.4 |
| Offering a Bouquet of Bellflowers to the Ghost of a Drowned Man | Web Novel | chinese | 4.4 |
| Office Worker Who Hears Memories | Web Novel | korean | 4.0 |
| Office Worker’s Immortal Dungeon | Web Novel | japanese | 2.7 |
| Officer, I Didn’t Really Deal Dr*gs! I’m Selling Genuine Rock Candy | Web Novel | chinese | 3.9 |
| Oh My God! Earthlings are Insane! | Web Novel | chinese | 4.3 |
| Oh My God, I Actually Had A Second Child With My Cold Best Friend! | Web Novel | chinese | 3.4 |
| Oh My Ice Goddess | Published Novel | filipino | 3.8 |
| Oh No! As a Mage, Why Can I Only Cast Forbidden Spells? | Web Novel | chinese | 2.9 |
| Oh No! I can’t keep up my Evil Woman Persona anymore! | Web Novel | chinese | 3.8 |
| Oh No! I’ve Become the Frail White Moonlight of the Witches! | Web Novel | chinese | 3.6 |
| Oh No! They’re All Eyeing Me Like Tigers! | Web Novel | chinese | 3.5 |
| Oh No, I’ve Been Tricked by the Yandere Sisters of a Wealthy Family | Web Novel | chinese | 3.3 |