Vitamin D usually refers to Vitamin D, the group of fat-soluble prohormones.

It may also refer to:

• Ergocalciferol, also known as Vitamin D2
• Cholecalciferol, also known as Vitamin D3
• 22-Dihydroergocalciferol, also known as Vitamin D4
• Vitamin D5
• Calcifediol, also known as calcidiol: 25-hydroxycholecalciferol, or 25-hydroxyvitamin D (abbreviated 25(OH)D). Blood concentration of calcifediol is considered the best indicator of vitamin D status.
• vitamin D-related concepts, including:
  • Vitamin D and influenza
  • Hypervitaminosis D, toxicity caused by the ingestion of large doses of vitamin D
  • Hypovitaminosis D, a deficiency of vitamin D
  • GC (gene), the human gene group-specific component, the vitamin D binding protein
  • calcitriol receptor, also known as VDR, a receptor for vitamin D
  • Vitamin D-dependent calcium-binding protein
  • X-linked hypophosphatemia, also known as vitamin D-resistant rickets, a form of rickets for which ingestion of Vitamin D is relatively ineffective
• Vitamin D (Glee), an episode of the American musical comedy-drama television series Glee

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