GDI

GDI may stand for:

• Gasoline direct injection, a modern variant of fuel injection
• Gay Doctors Ireland, an independent grouping of LGBT medical professionals in Ireland
• Gender-related Development Index, an indication of the standard of living in a country, developed by the United Nations
• Global Defense Initiative, a fictional military organisation in the Command & Conquer computer game series
• Gonzaga Debate Institute, a popular summer policy debate workshop for high school students
• Graphics Device Interface, a core component of Microsoft Windows operating systems
• Gross domestic income, one of the National Income and Product Accounts
• Guanosine nucleotide dissociation inhibitors proteins in molecular biology
• Los Guerreros del Infierno, a Mexican professional wrestling stable
• God Damn Independent, a person not affiliated with a fraternity or sorority