GDI (plural GDIs)
- Gamma Delta Iota (ΓΔΙ) or God Damn Independent; A fictitious fraternity used by fraternity and sorority members to refer to people not affiliated with such organizations.
- (computing, Microsoft, Microsoft Windows) Graphics Device Interface
- (vulgar, slang) goddamn it.
- (computing): GDI+
GDI f (genitive GDI)