Isidoro Blaisten (January 12, 1933 – August 28, 2004) was an Argentine writer.
Son of David Blaisten and Dora Gliclij, Blaisten was born in Concordia, Argentina. His family was among the many Argentine Jews who populated rural areas in Entre Ríos Province during the early 20th century. Although born with the surname Blaistein, he would later spell it Blaisten, even though his signature occasionally read Blaistein.
He was a member of the Academia Argentine de Letras from 2001 until his death as well as a correspondent of the Real Academia Española, mixing literature with his profession as a neighborhood bookseller after having been a publicist and child photographer. He collaborated with the magazine El escarabajo de oro and other journalistic media in Argentina.