The Psalter of Louis X () is an illuminated psalter that belonged to King Louis X of France and his first wife, Queen Margaret. It is now in the library of Tournai Cathedral, shelfmark Tournai, Archives et Bibliothèque de la Cathédrale, B.C.T. A 17.
The psalter was made around 1315. It has 256 leaves of parchment (equal to 512 pages of text). It contains a calendar, the Vulgate Latin text of the biblical Book of Psalms, and a Litany of the Saints in addition to two short . It contains a decoration featuring a cat.
The psalter contains several drolleries: