- P21 (disambiguation)
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P21, p21 or P-21 may refer to:
- The p21/waf1 protein, also known as cyclin-dependent kinase inhibitor 1 or CDK-interacting protein 1
- The p21/ras protein, part of the RAt Sarcoma family of proteins
- Curtiss XP-21, an American fighter aircraft of the 1920s
- LÉ Emer (P21), a patrol vessel of the Irish Navy
- The tax form P21 accompanies tax refunds in Ireland.
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- Letter-number combination disambiguation pages
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