Merck may refer to:

• Merck & Co., Inc. (aka MSD, MERCK SHARP & DOHME), the USA pharmaceutical company that was spun off from the German pharmaceutical company Merck KGaA during World War I
• Merck KGaA, the German pharmaceutical company
• 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.
• Johann Heinrich Merck (1741-1791), German author and literary critic.

See also: mIRC - an IRC program.

Merck | Merck