Octavia Hubertus Claessens, Angelina (birth 3 Apr 1881 Wiekevorst ,B - died 8 May 1959 Lier ,B)
Oeri van Rees, Reeltje (birth 24 Nov 1811 Nijkerk - died 13 Aug 1866 Hoorn)
Olivier, Salomon (birth 1 Apr 1826 Amsterdam - died 28 Dec 1851 Hoorn)
Olman, Betje (birth 22 Jan 1841 Hoorn - died 11 Nov 1905 Amsterdam)
Olman, Carolina (birth 7 Jul 1846 Hoorn - died 6 Nov 1912 Amsterdam)
Olman, David (birth 19 Jun 1874 Alkmaar - died 28 May 1943 Sobibor ,Concentratiekamp)
Olman, Eliazar (birth 10 Sep 1830 Hoorn - died 2 Dec 1844 Hoorn)
Olman, Israel (birth 30 Sep 1838 Hoorn - died 15 Aug 1926 Amsterdam)
Olman, Jesajas (birth 1808 Gouda - died 13 Dec 1847 Hoorn)
Olman, Machiel (birth 29 May 1867 Amsterdam - died 5 Mar 1943 Sobibor ,Concentratiekamp)
Olman, Mozes (birth 12 Sep 1843 Hoorn - died 11 Oct 1847 Hoorn)
Olman, Mozes (birth 2 Apr 1837 Hoorn - died 5 Jul 1837 Hoorn)
Olman, Saartje (birth 15 Oct 1835 Hoorn - died 29 Nov 1835 Hoorn)
Olman, Sophia (birth 22 Mar 1865 Hoorn - died 12 Aug 1944 Theresienstadt ,Concentratiekamp)
Onderwijzer, Rachel (birth 29 Jul 1826 Blokzijl - died 13 Mar 1883 Hoorn)
Oostra, Marianne (birth 21 Jan 1908 Utrecht - died 15 Apr 1945 Wittenberge ,Concentratiekamp)
Oostra, Rachel (birth 19 Jan 1835 Medemblik - died 8 Nov 1910 Coevorden)
Ouds, Rachel (birth 9 Nov 1879 Amsterdam - died 7 Dec 1932 Amsterdam)
Overste, Betje (birth 1 May 1885 Amsterdam - died 15 Dec 1975 Bussum)