- Ashby MagnaA village and civil parish in Harborough district, Leicestershire, England (OS grid ref SP5690).
- bigfin squidAny member of the genus Magnapinna of rarely seen squid, characterized by extremely long arms and tentacles, and being the only squid known to inhabit the hadal zone of the ocean.
- Chew MagnaA village and civil parish in Bath and North East Somerset, Somerset, England (OS grid ref ST5763).
- Magna CartaA landmark document that sets out rights or important principles.
- magnascopeA large optical instrument used to get a close-up of small objects.