The Orthodox rabbi made his comments the same weekend that a 19 year-old gay, Jewish South African man committed suicide.
Israeli Education Minister Rafi Peretz has said he believes so-called “gay conversion therapy” can work, triggering widespread condemnation.
“I think it’s possible,” Mr Peretz, an Orthodox rabbi, told Israel’s Channel 12 TV channel. He added that he had “a very deep familiarity with the issue”.
PM Benjamin Netanyahu said such remarks were “unacceptable”. Other politicians and gay groups also voiced criticism.
“Gay conversion therapy” has been widely discredited around the world.