Hemp (from Old English hænep) is a term reserved mainly for low tetrahydrocannabinol (THC) strains of the plant Cannabis sativa. Of the approximately 2000 cannabis plants varieties known, about 90 ontain only low-grade THC and are most useful for their fiber, seeds and medicinal or psychoactive oils. Scholars believe that hemp is humankind's oldest cloth and hemp-limestone composites have been found in ancient Roman architecture.

Hemp may refer to:

• Hemp, Cannabis as a source of industrial, food and other non-drug products, including cultivation information.
• Hemp HEMP the trading symbol for Marijuana Inc, a publicly traded company also quoted as HEMP PK on the OTC Markets.
• Cannabis, Cannabis as a source of industrial, food and other non-drug products, including cultivation information.'Cannabis as a genus of plant
• Cannabis (drug), about the use of C. sativa and C. indica as drugs, including Marijuana, Hashish, and others.
• Cannabis (drug) cultivation, about cultivation of the Cannabis plants to produce drugs.
• HEMP Party, "Help End Marijuana Prohibition," an Australian political party
• Kenaf (Hibiscus cannabinus), also known as "Ambari hemp" and "Deccan hemp"
• Roselle Fiber (Hibiscus sabdariffa), known as "Roselle hemp".
• Jute (Corchorus genus), known as "Bengal hemp", "Calcutta hemp", and "Madras Hemp"
• Manila hemp (Musa textilis)
• Sisal (Agave sisalana), known also as "sisal hemp"
• High-altitude Electromagnetic Pulse, an electromagnetic bomb
• HEMP Energy Drink, New Zealand Energy drink available in New Zealand and Australia.