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- S. O'Brien (O'Brien/Synge matching conditions),
- Peter O'Donnell (Lanczos potential theory),
- Niall Ó Murchadha (initial value formulation, proof of the Penrose inequality in spherical symmetry (with E. Malec), mathematical relativity including analysis of quasi-local mass and the constraint equations),
- Robert Oppenheimer (gravitational collapse, OS dust),
- Amos Ori (black hole interiors, time machines, radiation reaction, gravitational collapse),
- István Ozsváth (Ozsváth/Schücking plane wave),
Read more about this topic: Contributors To General Relativity