DIIS
| Acronym | Definition |
|---|---|
| DIIS | Danish Institute for International Studies (Denmark) |
| DIIS | Direct Inversion in the Iterative Subspace (Pulay mixing) |
| DIIS | Draft Integrated Impact Statement (community study; Australia) |
| DIIS | Diatomics-In-Ionic-Systems |
| DIIS | Directorate for Intelligence and Information Security |
| DIIS | DECCO Integrated Information System |