Benzimidazole is an organic compound. It has the chemical formula C₇H₆N₂. It is made of a benzene ring that shares a side with an imidazole ring. Like benzene and imidazole, it is an aromatic compound.

Chemicals that have the benzimidazole structure are called benzimidazoles. The chemical benzimidazole has few uses, but many benzimidazoles are used as drugs, plastics and dyes.

Some examples of benzimidazoles:

• Angiotensin II receptor blockers such as azilsartan, candesartan, and telmisartan.
• Anthelmintic agents such as albendazole, ciclobendazole, fenbendazole, flubendazole, mebendazole, oxfendazole, oxibendazole, triclabendazole, and thiabendazole.
• Antihistamines such as astemizole, bilastine, clemizole, emedastine, mizolastine, and oxatomide.
• Benzimidazole fungicides such as benomyl, carbendazim, fuberidazole, and thiabendazole.
• Nitazenes, or Benzimidazole opioids, such as bezitramide, brorphine, clonitazene, etodesnitazene, etonitazene, etonitazepipne, etonitazepyne, isotonitazene, metodesnitazene, and metonitazene.
• Proton-pump inhibitors such as dexlansoprazole, esomeprazole, ilaprazole, lansoprazole, omeprazole, pantoprazole, rabeprazole, and tenatoprazole.
• Typical antipsychotics such as benperidol, clopimozide, droperidol, neflumozide, and oxiperomide, and pimozide.
• Benzimidazole can also be found in abemaciclib, bendamustine, dabigatran, daridorexant, and glasdegib.

When printed circuit boards are manufactured (or made), benzimidazole can be used as an organic solderability preservative. (When that kind of preservative gets used, it can protect copper contacts (for years), until the contact gets soldered.)