Reiner Braun (born 22 December 1952 in Braunschweig) is a German journalist, historian and peace activist.

He is executive director of the International Peace Bureau (IPB).

[2] Confronted with the growing danger of nuclear threats he started his activism against nuclear weapons from a young age.

[3] He work for the Krefeld Appeal against nuclear weapons.

[4][3][5] He is a founding member of the International Network of Engineers and Scientists for Global Responsibility (INES)[6] and from 2006 until 2017 he was executive director of the German section of the International Association of Lawyers against Nuclear Arms (IALANA).