Libellus Sanguinis is a line of four tabletop role-playing game supplements released by White Wolf Publishing in 1997–2001, for use with their game Vampire: The Dark Ages.

The line includes Masters of the State (1997), Keepers of the Word (1998), Wolves at the Door (2000), and Thieves in the Night (2001).

The Libellus Sanguinis line consists of four sourcebooks intended to be used with the tabletop role-playing game Vampire: The Dark Ages.

They each describe three of the vampire clans in the setting, as they appeared in medieval times.

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