- DIAM stands for Diameter
- DIAM stands for Denso International America (automotive technology; various locations)
- DIAM stands for Diffusion Art Musique (French: Art Music Distribution)
- DIAM stands for Diffusion Internationale d’Articles Manufacturés (French: International Diffusion of Manufactured Goods)
- DIAM stands for Defense Intelligence Agency Manual
- DIAM stands for Defense Intelligence Agency Memorandum (US DoD)
- DIAM stands for Data Independent Accessing Model
- DIAM stands for Drug Interactions Analysis and Management (reference guide)
- DIAM stands for Division of Imaging and Applied Mathematics
DIAM