| Dore O. | Work | Biography | Bibliography | Characteristics |
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| Wendy Oberlander | Work | Biography | Bibliography | Characteristics |
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| Vaughn Obern | Work | Biography | Bibliography | Characteristics |
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| George Obremski | Work | Biography | Bibliography | Characteristics |
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| Marcel Odenbach | Work | Biography | Bibliography | Characteristics | Critical Response |
| Odin Teatret | Work | Biography | Bibliography | Characteristics |
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| Nobuhiko Ohbayashi | Work | Biography | Bibliography | Characteristics |
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| Jenny Okun | Work | Biography | Bibliography | Characteristics |
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| Pat O'Neill | Work | Biography | Bibliography | Characteristics |
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| Yoko Ono | Work | Biography | Bibliography | Characteristics |
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| Dennis Oppenheim | Work | Biography | Bibliography | Characteristics |
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| Michael O'Reilly | Work | Biography | Bibliography | Characteristics |
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| Jerry Orr | Work | Biography | Bibliography | Characteristics |
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| Steve Osborn | Work | Biography | Bibliography | Characteristics |
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| Vivian Ostrovsky | Work | Biography | Bibliography | Characteristics |
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| Philip Ostrow | Work | Biography | Bibliography | Characteristics |
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| Tony Oursler | Work | Biography | Bibliography | Characteristics |
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| Edward Owens | Work | Biography | Bibliography | Characteristics |
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| Kyo Ozawa | Work | Biography | Bibliography | Characteristics |