Menachem Shlomo Bornsztain (11 October 1934–10 August 1969), also spelled Borenstein, Bornstein, or Bernstein, was the fifth rebbe of the Sochatchov Hasidic dynasty.

He was known as the Sochatchover-Radomsker Rebbe, having also accepted the leadership of the Radomsk Hasidic dynasty upon the request of its surviving Hasidim, whose leaders had been murdered in the Holocaust.

At his circumcision ceremony, which normally takes place at eight days old but was delayed until his sixth week of life due to illness, he was named Menachem Shlomo after his paternal great-grandfather, Rabbi Menachem Mendel of Kotzk, and his maternal ancestor, Rabbi Shlomo Rabinowicz.

[1] Starting in 1965 Bornsztain led Kollel Keser Torah Radomsk in Bnei Brak, named after the network of 36 yeshivas in pre-war Poland established by the fourth Radomsker rebbe and headed by Bornsztain's uncle, David Moshe Rabinowicz, who had been murdered by the Nazis in the Warsaw Ghetto.

[1] On 10 August 1969 (26 Av 5729) Bornsztain was thrown from a taxi when an army vehicle crashed into it head-on.