Tzvi Jacob Avni (first name sometimes spelled Zvi; ; born Hermann Jakob Steinke, September 2, 1927; Saarbrücken) is an Israeli composer.
Tzvi Avni was born in Saarbrücken, (now Germany), and emigrated to Mandate Palestine as a child. He studied with Paul Ben-Haim.
On the recommendation of Edgard Varèse, he became involved with the Columbia-Princeton Electronic Music Center in the 1960s. Later he founded an electronic studio at the Jerusalem Academy of Music, following the guidelines of his mentor in New York, Vladimir Ussachevsky.
In 2001, Avni was awarded the Israel Prize, for music. On September 11, 2012, Avni was made an honorary citizen of Saarbrücken.