Other
- Independent school district
- Information Services Department of the Hong Kong Government
- Information Services Division of NHS National Services Scotland
- Inhibited sexual desire, old name for hypoactive sexual desire disorder
- Institute for Strategic Dialogue, London-based international affairs think tank
- Instructional systems design, also known as instructional design
- International Subscriber Dialling, also known as International Direct Dialling
- Intermediate school district
- Internal Security Department of the Republic of Singapore
- Internet Standards Documentation, documentation for Internet standards, issued by the Internet Engineering Task Force (IETF)
- Team ISD, professional cycling team
- Isosorbide dinitrate, by the abbreviation ISD
- Ian Stuart Donaldson, British musician
- Investor-State Dispute
Read more about this topic: ISD