Merck may refer to:

• Merck KGaA, (EMD Chemicals in the United States and Canada), a German-based chemical and pharmaceutical company.
  • Merck Serono (EMD Serono in North America), the pharmaceutical division of Merck KGaA
  • Merck family, a family of pharmacists who eventually founded Merck KGaA
• Merck & Co., Inc. (Merck Sharp & Dohme outside of North America), an American pharmaceutical company created after World War I from assets forfeited by Merck KGaA, though the two are unassociated
  • Merck Manual of Diagnosis and Therapy, a medical textbook published by Merck & Co
  • Merck Index, an encyclopedia of Chemistry, published by Merck & Co
• Merck Records, an IDM and experimental hip hop record label based in Miami, Florida, USA

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