Merck may refer to:
- Merck & Co., Inc. ( MSD, Merck Sharp & Dohme outside of the United States and Canada), the USA pharmaceutical company created from assets forfeited after World War I by:
- Merck KGaA, (EMD in the United States and Canada) the German pharmaceutical and chemical company whose American assets were seized and used to create Merck & Co.
- Merck Serono, the pharmaceutical division of Merck KGaA which is known in the US as EMD Serono and is not associated with Merck & Co.
- the Merck Manual, a medical textbook published by Merck & Co.
- the Merck Index, an encyclopedia of Chemistry, published by Merck & Co.
- Merck Records, an IDM and experimental hip hop record label based in Miami, Florida.
- Merck family, any member of the Merck family that founded Merck KGaA
