Deca, Decas or DECA may refer to:
Deca-, a metric prefix
Nandrolone, the active ingredient in the steroid Deca-Durabolin, commonly referred to as Deca
Decabromodiphenyl ether, an organic compound
Deca-press, Moldavian news agency
Deca (journalism collective), a journalism cooperative
Deca i Sunce (Children and the Sun), album by the Serbian hip-hop artist Marčelo
Deca Sports, sports video game series for the Wii
Decas (album), compilation album by the American metal band As I Lay Dying
DECA Games, video game company
