A handcuff cover is a plastic or metal cover that can be placed over a pair of handcuffs. It consists of a hinged, box-like assembly locked over the handcuff chain, wristlets and keyholes.

The first handcuff cover was invented by J. D. Cullip and K. E. Stefansen and patented in 1973. It is made from high-strength, high-impact ABS plastic and is still distributed by C & S Security Inc. as "Black Box" handcuff cover. Other companies sell similar devices, e.g. CTS Thompson ("Blue Box" handcuff