Groups
- overrunner 6
- oversight 1
- overture 1
- oving 251
- owakari itadaketa darou ka 98
- owan 4
- owanko club 5
- owarai butai take team 1
- owari no hajimari 1
- owari yokereba subete yoshi 1
- owl 1
- owligator studios 2
- owlpop 1
- owow 1
- owxy 6
- oxg 15
- oxide.lab 22
- oxide.lab 11
- oxydan 7
- oxygen 2
- oxymoron 1
- oxytocin no gogo 8
- oyajiji gumi 17
- oyako donburi tei 3
- oyakodon 52
- oyama dennou giken 57
- oyama kikunosuke vs 14
- oyaniha mada yuttemasen 1
- oyashiki 3
- oyasumi 1
- oyasumi disco 1
- oyasumi kobe gyuu 3
- oyasumi switch 2
- oyasuminasai 2
- oyatsukan 9
- oyogi 6
- oyoyo 5
- oyt shuppan 1
- oz 4
- oz project 4
- oz69 2
- ozashiki 84
- ozawa kobo 4
- ozen shiryoushitsu 2
- ozexe 1
- oziketto 6
- ozitan yasan 26
- ozo 3
- ozon dance 2
- ozone 49