- O'Neil, Henry Nelson, A.R.A., 1817 - 1880
- Oakes, John Wright, A.R.A., 1820 - 1887
- Ocean, Humphrey, R.A., 1951 -
- Oliver, Archer James, A.R.A., 1774 - 1842
- Olsson, Julius, R.A., 1864 - 1942
- Opie, John, R.A., 1761 - 1807
- Orchardson, William Quiller, R.A., 1832 - 1910
- Orpen, William, R.A., 1878 - 1931
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