Liber Niger

Liber Niger ("Black Book") may refer to:

• The Liber Niger, a chartularium of the Anglican archdiocese of Dublin by John Alen (1476–1534), Archbishop of Ireland
• The Liber Niger, the management manual of the English royal household from the reign of Edward IV through to the reign of Henry VIII
• Letter-Book B, also known as the Liber Niger, the second of the Letter-Books of the City of London, recording the business of the City from 1275–1298