| DCA | Defense Communications Agency | - | Atmospheric Research Center |
| DCA | Dollar Cost Averaging | - | Chatting Acronyms |
| DCA | Detrended Correspondence Ordination Analysis | - | Computer Acronyms(common) |
| DCA | Discriminant Component Anal. | - | Computer Acronyms(common) |
| DCA | Dressed-cluster Approximation (in Band-structure Calcns.) | - | Computer Acronyms(common) |
| DCA | Defensive Counter Air ?DiChloroAcetate -Ronald Reagan Washington National Airport (IATA Code) | - | Astronomy |
| DCA | Washington National Airport | - | Business and Finance |
| DCA | Data Collection Assignment | - | Business and Finance |
| DCA | distributed component architecture
| - | Human Genome |
