Grinshtein (Grinstein) Isaak Bentsionovich (b. 2 February 1923, Izrailovka village, Ustinovsky District, Kirovohrad Oblast) — physician.

Isaak Grinshtein was the son of Bentsion Grinshtein (b. 1892, Ukraine – d. unknown, Izmail) and Esfir Grinshtein (née Chigrinskaya) (1894, Ukraine – 1989, Izmail).

From 1969 to 1990, he worked as a physician at the Riga Municipal Dermatology and Venereology Dispensary.

In his marriage to Nadezhda Grinshtein (née Fuksone) (b. 1931, Konstantinovka, Donetsk Oblast), he had two daughters: Yelena Grinshtein (b.1955, Riga) and Irina Grinshtein (b. 1966, Riga).

In 1990, Isaak Grinshtein received permission to emigrate to Israel.

Nadezhda Grinshtein (née Fuksone) (b. 1931, Konstantinovka, Donetsk Oblast) — wife
Yelena Grinshtein (b. 1955, Riga) — daughter
Irina Grinshtein (b. 1966, Riga) — daughter
Bentsion Grinshtein (b. 1892, Ukraine – d. unknown, Izmail) — father
Esfir Grinshtein (née Chigrinskaya) (1894, Ukraine – 1989, Izmail) — mother
Leninida Chertkova (née Grinshtein) (b. 1925, Kirovohrad) — sister
Felix Grinshtein (b. 1930, Kirovohrad) — brother