NUI as an acronym may refer to:
- National University of Ireland
- Natural User Interface
- Normally unmanned installation
- Novell Users International
- Network Users Institute
Nui can refer to:
- Nui (atoll), a group of islands in Tuvalu
- Nui, a type of noodle in the Cuisine of Vietnam
- Núi, Mountain in Vietnamese
- Núi, Mountain Trading and Service Co.Ltd
- Nui, Means "Many" or "Wide" in native Hawaiian language
- Muchachada Nui, a Spanish humor television program
- libnui, a multi-platform C++ toolkit with hardware accelerated UI rendering
- nUI, an addon for World of Warcraft game
Not to be confused with:
- Nuie, an island nation located in the South Pacific Ocean