- OrbitWilliam Orbit (威廉姆·奥比特)
- Optical Illusions EPWilliam Orbit (威廉姆·奥比特)
- Our Pathetic Age (Explicit)DJ Shadow (DJ影子)
- Out of the BlueFleurie
- Outside Of The Lines (feat. Laurell)Laurell
- Outside Of The Lines (feat. Laurell) (Extended Mix)Laurell
- 뮤지컬 마타하리 OST Part.1 (玛塔哈丽 OST Part.1)임슬옹 (任瑟雍)
- Outside Of The Lines (feat. Laurell) (Remixes)Laurell
- OdysseyWilliam Orbit (威廉姆·奥比特)
- One UpCheryl B. Engelhardt
- Outta Sight (Outta Mind)Fleurie
- One To Grow OnDJ Shadow (DJ影子)
- O Come All Ye FaithfulHappy Tunes (欢乐曲调)
- 맨도롱 또똣 OST Part.5손승연 (孙胜妍)
- Only Thing (Alternative Mix)Fleurie
- oto noteCanappeco (小草帽)
- 조선혼담공작소 꽃파당 OST Part.3 (花党：朝鲜婚姻介绍所 OST Part.3)손승연 (孙胜妍)
- 아이템 OST Part.1 (道具 OST Part.1)손승연 (孙胜妍)
- Once Upon a Time in Texas (Original Motion Picture Soundtrack)Jamie Christopherson
- 나쁜 형사 OST Part.1 (坏刑警 OST Part.1)손승연 (孙胜妍)
- Our God (Performance Tracks)Chris Tomlin (克里斯托弗·德韦恩·汤姆林)
- 훈남정음 OST Part.5 (勋男正音 OST Part.5)손승연 (孙胜妍)
- 대군 OST 二划 (이획) ("大君"OST 二划)손승연 (孙胜妍)
- Out of ControlChrisette Michele (克里斯蒂·米歇尔)
- On the Road to Kingdom ComeHarry Chapin
- 꽃선비 열애사 O.S.T Part.6손승연 (孙胜妍)
- One Determined HeartPaulini (普尔里妮)
- 어게인 마이 라이프 OST Part.2 (再次我的人生 OST Part.2)손승연 (孙胜妍)
- 세상 어디에도 없는 착한남자 OST Part.3 (善良的男人(KBS水木剧) Part.3)조은 (赵恩)
- 부부의 세계 OST Part.3 (夫妻的世界 OST Part.3)손승연 (孙胜妍)
- 에픽세븐 OST ′REVIVE′ (Epic Seven (Original Soundtrack) 'REVIVE')손승연 (孙胜妍)
- Outside the LinesMattyB (马修·莫里斯)
- 신의 퀴즈 : 리부트 (Original Television Soundtrack), Pt. 3 (Quiz of God : REBOOT (Original Television Soundtrack), Pt. 3)조은 (赵恩)
- 부잣집 아들 OST Part.3 (富家公子 OST Part.3)조은 (赵恩)
- 유혹 OST Part.6 (Temptation OST Part.6) (诱惑 OST Part.6)Lucky J (럭키제이)
- On The Way To LovePatti Austin (帕蒂·奥斯汀)
- ～Outgrow～Gero
- Original Album ClassicsJeff Buckley
- one (初回限定盤B)Gero
- Other Voices, Other RoomsNanci Griffith (南西·葛瑞芬)
- Other Voices Too ( A Trip Back To Bountiful)Nanci Griffith (南西·葛瑞芬)
- 오렌지 마말레이드 OST Part.1 (橘子果酱 OST Part.1)환희 (焕熙)
- Once In A Very Blue MoonNanci Griffith (南西·葛瑞芬)
- oneGero
- 로드 넘버원 OST Part.1 (Road No.1 OST Part.1)환희 (焕熙)
- 함부로 애틋하게 OST Part.10 (Uncontrollably Fond OST Part.10)환희 (焕熙)
- One Fair Summer Evening [live]Nanci Griffith (南西·葛瑞芬)
- 군주 - 가면의 주인 OST Part.9 (君主 - 假面的主人 OST Part.9)환희 (焕熙)
- OverNitro fun
- Ode to JoyWilco (照办乐队)
- Oxygen王嘉尔 (Jackson)
- OAD「VitaminX Animation」キャラクターソング鈴木達央 (すずき たつひさ)
- 으라차차 와이키키 OST Part.2 (加油！威基基 OST Part.2)조형우 (曺炯雨)
- OKAY王嘉尔 (Jackson)
- Old Friends - New RoadsAllan Taylor (艾伦·泰勒)
- One Too Many MorningsAllan Taylor (艾伦·泰勒)
- Original Album ClassicsJoe Satriani (乔·塞奇尼)
- Open Your EyesSchool of Seven Bells
- One WorldIsgaard (伊思嘉)
- Outside In (Single Edit)Celldweller (居民乐队)
