Vitamin D is a group of fat-soluble prohormones.

Vitamin D may also refer to:

• Ergocalciferol (vitamin D₂)
• Cholecalciferol (vitamin D₃)
• 22-Dihydroergocalciferol (vitamin D₄)
• Vitamin D₅

• "Vitamin D" (Glee), an episode of the television series Glee
• "Vitamin D" (song), a song by Ludacris and Ty Dolla Sign

• Calcifediol (25-hydroxyvitamin D or 25(OH)D), an indicator of vitamin D status in the blood
• Calcitriol (1,25-dihydroxyvitamin D or 1,25(OH)₂D), the active hormonal form of vitamin D
• Calcitroic acid (1,24,25-trihydroxyvitamin D), the major metabolite of calcitriol
• Vitamin D and respiratory tract infections
• Vitamin D and neurology
• Vitamin D toxicity, hypervitaminosis D, toxicity caused by the ingestion of large doses of vitamin D
• Vitamin D deficiency, hypovitaminosis D, a condition with deficiency of vitamin D
• Vitamin D-binding protein, encoded by the GC gene, binds vitamin D in blood
• Vitamin D receptor (VDR), or calcitriol receptor, the intracellular receptor for vitamin D
• Vitamin D response element (VDRE) is a DNA sequence found in the promoter region of vitamin D regulated genes
• Vitamin D-dependent calcium-binding proteins, including calbindins and S100G
• Vitamin D resistant rickets, X-linked hypophosphatemia, a form of rickets for which ingestion of vitamin D is relatively ineffective

This disambiguation page lists articles associated with the title Vitamin D.
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