- ChemGlobe: Hafnium
- Electronic, thermal, and steric data along with an isotope table.
- ChemicalElements.com: Hafnium
- Basic information, atomic structure, and isotopes.
- EnvironmentalChemistry.com: Hafnium
- Atomic structure, chemical and physical properties, and table of nuclides.
- It's Elemental: Hafnium
- Basic physical and historical information.
- LANL: Hafnium
- History, properties, uses, and handling.
- Lenntech: Hafnium
- Physical data, chemical properties, health and environmental effects.
- Visual Elements: Hafnium
- General and physical information, source, uses, key isotopes, and ionisation energies.
- Wikipedia: Hafnium
- Properties of the element, including its history, applications, and characteristics.
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