Leo Slezak was an Austrian dramatic tenor. He was associated in particular with Austrian opera as well as the title role in Verdi's Otello. He is the father of actors Walter Slezak and Margarete Slezak and grandfather of the actress Erika Slezak.

Otello is an opera in four acts by Giuseppe Verdi to an Italian libretto by Arrigo Boito, based on Shakespeare's play Othello. It was Verdi's penultimate opera, first performed at the Teatro alla Scala, Milan, on 5 February 1887.