Insu may refer to:
- İnsu, village in Yenişehir District, Turkey
- Insu-dong, neighbourhood of Gangbuk-gu, Seoul, South Korea
- Insu (Korean name), Korean unisex given name
- Queen Insu (1437-1504)
INSU may refer to:
- Insituform, British provider of trenchless technologies for gravity and pressure pipelines
- Institut national des sciences de l'univers (National Institute for Earth Sciences and Astronomy) of the French Centre national de la recherche scientifique
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