O'Beirne, James Lyster (b. 1820) Stenton 1976

O'Connell, Daniel (1775–1847) ODNB

O'Connor, Dr (fl. 1857) PU1/33/9/3

O'Connor, Henry (1858–1915) RLIN

O'Dell, Stackpool Edward (fl. 1880) WBI

Odger, George (1813–77) ODNB

Odiardi, E Savary D' (fl. 1893) RLIN

Odling, William (1829–1921) DSB

O'Donaghue, Daniel (fl. 1862) PU1/42/9/1

O'Driscoll, Alexander (fl. 1844) WBI

Oersted, Hans Christian (1777–1851) DSB

Offenbach, Jacques (1819–80) CBD

Ogg, — (fl. 1826) [Ogg] 1826

Ogilby, John (1600–76) ODNB

Ogilvie Gordon (née Ogilvie), Dame Maria Matilda (1864–1939) ODNB

Ogilvie, William (1846–1912) WBI

Ogle, John William (1824–1905) ODNB

Ólafsson, Eggert (1726–68) WBI

Olaus Magnus (1490–1557) DSB

Olbers, Heinrich Wilhelm Matthias (1758–1840) DSB

Olcott, Henry Steel (1832–1907) WBI

Oldfield, Josiah (1863–1953) ODNB

Oldham, H Yule (fl. 1913) WBI

Oldham, Joseph R (fl. 1891) RLIN

Oliphant, Laurence (1829–88) ODNB

Oliver, Daniel (1830–1916) ODNB

Oliver, Mr G E (fl. 1895) RR1/12/5b/11

Oliver, Sir Thomas (1853–1942) ODNB

Olivier, Guillaume Antoine (1756–1814) WBI

Olmsted, Denison (1791–1859) WBI

O'Loghlen, Sir Colman Michael (1819–77) ODNB

Olszewski, Karol Stanislaw (1846–1915) DSB

Oppel, Michael (1782–1820) WBI

Oppenheim, Prof Annie Isabella () RR1/6/6a/6

Oppert, Julius (1825–1905) WBI

Ord, George (1781–1866) WBI

Ordway, John Morse (1823–1909) WBI

O'Reilly, Myles William Patrick (1825–80) ODNB

Orfila y Rocher, Mateo José Buenaventura (1787–1853) WBI

Orloff, Alex (Swedish inventor) (fl. 1899) RR1/19/6a/5

Ormerod, Eleanor Anne (1828–1901) ODNB

Ormsby, John (1829–95) ODNB

O'Rourke, Edmund. See Falconer, Edmund

Orton, Arthur (b. 1834) ODNB

Orton, James (1830–77) DSB

Osborn, Sherard (1822–75) ODNB

Osborne, Mr (fl. 1868) PU1/54/18/1

Osei Tutu Kwame, King of Asante (1779–1823) WBI

Osgood, Fletcher (fl. 1897) RR1/16/2b/12

O'Shaughnessy, Sir William Brooke (1809–89) ODNB

Osten-Sacken, Carl Robert (1828–1906) RLIN

Ostwald, Friedrich Wilhelm (1853–1932) DSB

O'Sullivan, D R () WIVP

Oswald, Felix Leopold (1845–1906) WBI

Otter, William (1768–1840) ODNB

Ottley, Richard (fl. 1829) WM3/4/2ei/9

Otto, Friedrich Julius (1809–70) WBI

Oudney, Walter (1790–1824) ODNB

Outerbridge, Alexander Ewing (1850–1928) WBI

Oviedo y Valdés, Gonzalo Hernández de (1478–1557) CBD

Owen, J B (fl. 1862) PU1/42/2/5

Owen, John (1616–83) ODNB

Owen, Richard (1804–92) DSB

Owen, Robert (1771–1858) ODNB

Owen, Robert Dale (1801–77) ODNB

Owen, William Fitzwilliam (1774–1857) ODNB

Oxenham, Henry Nutcombe (1829–88) ODNB

Oxford, 1st Earl of. See Asquith, Herbert Henry