The Registry of Proscribed Charmable Objects is a list maintained by the Ministry of Magic. It presumably covers all the items that wizards and witches are legally forbidden to modify with magic.

The Registry is likely connected with the Misuse of Muggle Artefacts Office. Arthur Weasley mentioned that carpets are defined as a "Muggle Artefact" by the Registry when barring the importation of flying carpets into Britain by Ali Bashir.