- Ohio Baptist General Convention Mass Choir
- Ohio City Singers
- Ohio Defiance
- Ohio Express
- Ohio Grimes and Misted Meanies
- Ohio Knox
- Ohio Light Opera
- Ohio Light Opera Orchestra
- Ohio National Baptist Mass Choir
- Ohio Penitentiary 511 Jazz Ensemble
- Ohio Players
- Ohio State University Marching Band
- Ohio State University Wind Symphony
- Ohio University Singers
- Ohioan
- OHITSBRADY
- Ohkami No Jikan
- OH!KAY
- Ohki Masao
- Öhlerbuam
- Ohm
- Ohm
- Ohm
- O.H.M.
- Ohm
- Ohm Arc
- Ohm Boys
- OHM Creator
- Ohm Fat
- Ohm-G
- Ohm Guru
- Ohm Powah
- Ohm Square
- Öhman Organ Grinders
- Ohmboyz
- Oh!mega
- Ohmega Tribe
- Ohmega Tribe
- Ohmega Watts
- oHMEGARED
- Ohmna
- Ohmphrey
- OHMS
- O.H.M.S.S.
- Ohmu Guru
- Ohmya Twang
- OHN
- Ohne 4 Gespielt Drei
- Ohnia:Kara Singers
- Ohno
- 大野克夫
- Ohno Katsuo Band