IHSS may refer to:
- Honduran Social Security Institute (Instituto Hondureño de Seguridad Social in Spanish), social security in Honduras
- Idiopathic hypertrophic subaortic stenosis, an older term for hypertrophic obstructive cardiomyopathy (HOCM)
- International Humic Substances Society, a scientific society that seeks to advance knowledge and research of natural organic matter
This disambiguation page lists articles associated with the title IHSS.
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