Joachim Cuntz (born 28 September 1948 in Mannheim) is a German mathematician, currently a professor at the University of Münster.

Joachim Cuntz has made fundamental contributions to the area of C*-algebras and to the field of noncommutative geometry in the sense of Alain Connes.

He was one of the first to apply K-theory to noncommutative operator algebras and contributed to the development of that theory.

In recent years, he has been working mainly on C*-algebras that are related to structures from number theory.

[1][2] Joachim Cuntz had dozens of PhD students and research assistants, many of which are professors in mathematics today.