- ChemGlobe: Niobium
- Electronic, thermal, and steric data along with a table of isotopes.
- ChemicalElements.com: Niobium
- Basic information, atomic structure, and isotopes.
- EnvironmentalChemistry.com: Niobium
- Atomic structure, chemical and physical properties, and table of nuclides.
- It's Elemental: Niobium
- Basic physical and historical information.
- LANL: Niobium
- History, sources, properties, and uses.
- Lenntech: Niobium
- Physical data, chemical properties, and health effects.
- USGS Minerals Information: Niobium
- Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
- Visual Elements: Niobium
- Image, uses, general information, and ionisation energies.
- WebElements: Niobium
- Extensive information on history, uses, occurrence, compounds, and properties of the element.
- Wikipedia: Niobium
- Properties of the element, including its history, applications, and characteristics.
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