SDH may refer to: Science, medicine and technology Serine dehydratase, an enzyme L-sorbose 1-dehydrogenase, an enzyme Succinate dehydrogenase, an enzyme Shubnikov–de Haas effect Social Determinants of Health, economic and social conditions of the population. Sorbitol dehydrogenase Subdural hematoma or subdural hemorrhage, brain bleeding Succinate dehydrogenase, in SDHA, SDHB, SDHC, SDHD Synchronous digital hierarchy, in telecommunications Organizations and places St David's Hall Social Democrats of Croatia Society for Digital Humanities Sonia, Daniel and Hecker Co. Sydney Dental Hospital Transportation Sudbury Hill Harrow railway station, England, National Rail station code Other The ISO 639-3 code for the Southern Kurdish language Subtitles for the deaf and hard-of-hearing