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- Edward Joseph Harrington O'Brien (1890–1941)
- Geoffrey G. O'Brien
- Ed Ochester (born 1939)
- Blanche Oelrichs (1890–1950)
- Ron Offen (1930–2010)
- Frank O'Hara (1926–1966)
- Sharon Olds (born 1942)
- Mary Oliver (born 1935)
- Alix Olson (born 1975)
- Charles Olson (1910–1970)
- George Oppen (1908–1984)
- Mary Oppen (1908–1990)
- James Oppenheim (1882–1932)
- Joel Oppenheimer (aka Jacob Hammer) (1930–1988)
- Peter Oresick
- Gregory Orr (born 1947)
- Alicia Ostriker (born 1937)
Read more about this topic: American Poets