Calcium cyanamide or CaCN₂ is a calcium compound used as fertiliser, first synthesized in 1898 by Adolph Frank and Nikodem Caro. It is formed when calcium carbide reacts with nitrogen.

Cyanamide is an organic compound with the formula CN₂H₂. This white solid is widely used in synthetic organic chemistry as well as in agriculture. It is also used as an alcohol deterent drug in Canada, Europe and Japan, but not in the United States.