DDDD

DDDD may refer to:

Arts and entertainment

 * Dead Dead Demon's Dededede Destruction, a 2014–2022 manga series
 * D.D.D.D. (Destroy Devastating and Disgusting Derivatives), a 1995 album by Incapacitants
 * D.D.D.D., the ending theme of episodes 5 and 6 of the anime series Dorohedoro

Other uses

 * DDDD, the Helmholtz notation for subsubcontra D (musical note)
 * DDDD, a U.S. bra size
 * DDDD, a non-standard SPARS code indicating digital recording equipment and musical instruments
 * dddd, a code used in date formats to indicate "day of the week spelled out in full"