Frank-Martin Strauß, better known as F.M. Einheit and also known as Mufti, (born 18 December 1958, in Dortmund) is an industrial and electronic musician, and actor, from Germany.

While primarily known for his percussion work with the influential industrial group Einstürzende Neubauten, he has also collaborated with KMFDM, Goethes Erben and recorded several albums in collaboration with other musicians (such as Diamanda Galás, Mona Mur, Andreas Ammer, Ulrike Haage) and solo. FM Einheit was also involved in the projects Stein and Gry.