Benzamidine is an organic compound with the formula C6H5C(NH)NH2.

The compound is a white solid that is slightly soluble in water.

It is usually handled as the hydrochloride salt, a white, water-soluble solid.

[3] The triangular diamine group gives it a distinctive shape which shows up in difference density maps.

Benzamidine is a reversible competitive inhibitor of trypsin, trypsin-like enzymes, and serine proteases.