Douglas John McCarthy (born 1 September 1966) is an English vocalist whose work covers a range of electronic music genres.

McCarthy has been the lead vocalist of the EBM band Nitzer Ebb since its formation in 1982. He released his a solo album, Kill Your Friends in 2012.

He worked in collaboration with DJ and producer Terence Fixmer as Fixmer/McCarthy, and with musician Cyrusrex as DJM/REX. McCarthy, Cyrusrex, and Nitzer Ebb bandmate Bon Harris formed the music collective Blackline along with such musicians as Paul Barker of Ministry, Mark Walk of Skinny Puppy, and Depeche Mode touring musician Christian Eigner.

McCarthy contributed as a guest vocalist on multiple tracks by Recoil, as well as recordings by Die Krupps, KLOQ, Client, Adult and Kenneth James Gibson's Reverse Commuter project.