Jakob Ullmann is a German composer and university professor.

Jakob Ullmann was born in Saxony, East Germany in 1958. After refusing to undergo military service in East Germany, Ullmann worked as groundskeeper, boilerman and house painter from 1978 until 1982. He studied Church Music in Dresden, and received a Doctorate in Philosophy. He studied composition privately with Friedrich Goldmann.

From 1982 onwards he worked as a composer and writer in Berlin, and since 2008 has been part of the music staff at the Academy in Basel.

Most of his recent works have been published by Edition RZ and Antoher Timbre.