Alternate names: Ostroh [Ukr], Ostrog and Острог [Rus, Yid אוסטרוג], Ostróg [Pol], Ostra, Ostraha, Ostre. 50°20' N, 26°31' E. 59 miles ESE of Lutsk (Łuck), 23 miles SSE of Rivne (Rovno). 1900 Jewish population: 9,208.

• Pinkas HaKehilot, Poland, Vol. 5 (1990), p. 34-41: "Ostrog"
• Shtetl Finder (1980), p. 68: "Ostraha, Ostrov".
• Museum of the History of Polish Jews
• Jewish Records Indexing - Poland
• JewishGen Ukraine SIG

Eight Yizkors:

• Gedolei Ostroho (Berdichev, 1907)
• Ostrog (Jerusalem-Tel Aviv, 1966)
• Pinkas Ostra; sefer zikaron... (Tel Aviv, 1960)
• Sefer Ostrog (Vohlin); matsevet zikaron le-kehila kedosha (Tel Aviv, 1987)
• Ven dos lebn hot geblit (Buenos Aires, 1954)
• Arim ve-imahot be-yisrael; matsevet kodesh le-kehilot yisrael she-nehrevu bi-yedei aritsim u-tmeim be-milhemet ha-olam ha-aharona, vol. 1 (Jerusalem, 1945-1960)
• more

Jewish Cemetery: The oldest inscriptions date from 1444. In 1968, the cemetery was destroyed.