ガールズ（地下）アイドルグループ
O行
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| OCHA NORMA | |
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| OliDOL! | |
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| Once Upon a Time | |
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| One Last Bloom | |
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| ONE LAST SHOT | |
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| ONE NEXT GIRLS | |
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| Onephony | |
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| ON THE AIR | |
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| ORIKA | |
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| OROCHI | |
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| OS1 | |
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| OS☆U | |
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| OTOMICHI | |
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| Otto | |
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| O-VER-KiLL | |
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