Rabbi Hillel Poisic (15.1.1881 Zlatopol, Kherson Governorate, Russian Empire – 1953 Tel Aviv, Israel) was a communal worker and Torah scholar.
He served as rabbi in Mohlika and in Zlatopol and composed Responsa and halakhic books about Sukkot, Maimonides and the letter of divorce (get).
His mother, Matalia, daughter of Zwi Sonik, was the granddaughter of Rabbi Chaim Chaikel Shapira from Kalininblatt (in Kiev district), father of Rabbi Judah Josef Loeb Shapira, president of the rabbinical court in Rakhmistrivka, and R. Israel Volodarsky, president of court in Petrikovka (in Kherson district).
When the pogroms began in Ukraine (in 1920) and the different gangs of robbers oppressed him much and threw him to the jail for several times, he decided to move to Romania.
Besides he also compiled and edited the works of his father, prepared a book about civil marriage and divorce in Russia (1952) and published about Torah and Judaism issues.
One ruling of Rabbi Poisic which became well known, was his opinion against the use of flashlights for Bedikat Chametz (Hillel Omer, Orach Chaim 231).