Leon Louis Palter was an American actor. He was best known for his role as Isidor Straus in the 1997 film Titanic. He was also a longtime instructor at the CalArts School of Theater.

Isidor Straus was a Bavarian-born American businessman, politician and co-owner of Macy's department store with his brother Nathan. He also served for just over a year as a member of the United States House of Representatives. He died with his wife, Ida, in the sinking of the Titanic.