Pre-World War II Jewish presence in Olyka dates back to the 16th century, and in the late 17th century the
Jewish community became one of the largest in the Volhyn Region. Olyka was the cradle of the Olyker
Hasidic dynasty that was founded by the famous Rabbi
Hersh Leib Landa the first Olyker rebbe. He was followed by his son Rabbi Yosef (Yoseph) Dovid, who was followed by his son Rabbi Mordechai (he authored a book called
Gedulas Mordechai). He was followed by his son Rabbi Shimon Shloima (he authored a book called
Shekel Hakodesh, and was father-in-law of Rabbi Yochanan Perlow of the
Karliner Dynasty), who was followed by his son Rabbi Alter Yosef (Yoseph) Dovid. In 1897 a total of 2,606 people – 50 percent of the total Olyka population – were Jews, and that amount increased when many Jewish refugees from nearby towns fled to Olyka during World War I.
The Holocaust Olyka's large Jewish community was completely destroyed during the
Holocaust, including
Nazi persecutions at the site of the
Radziwill Fortress/Olyka Castle. It is an important place of Jewish memory. Rabbi Alter Yosef Dovid Landa and his family perished. Around 150 Jews evacuated eastward; most Jews stayed in the ghetto. As part of the
Einsatzgruppen Aktion of August 1941, 720 Jews, including Rabbi Alter Yosef Dovid Landa, were killed at the Olyka Castle and at the town's Jewish cemetery towards
Czemeryn. In March 1942, Jews from surrounding villages were brought into Olyka, and a closed
ghetto was created with barbed-wire fence to imprison those inside. Monuments outside Olyka commemorate this massacre. Accounts vary as to the total number of Jews in and around Olyka who had died by the time the Olyka ghetto was liquidated in July/August 1942. Given the circumstances of Nazi massacres, it has been difficult to accurately count the dead. Most reports state the total amounted to 5,220 to 5,673 Jews. In early 1943, 130 remaining Jewish
artisans remaining in the ghetto were shot to death. Fewer than 30 Jews escaped to the forest in the summer of 1942. Of those survivors, 23 men created a
partisan unit with 30 Jews already outside the village. They joined the underground
resistance in the region against the Nazis, and a small number survived after early 1943. ==Population==