The Ars Notoria (The Notable Art) is the fifth and last part of The Lesser Key of Solomon. It was indeed a grimoire known since the Middle Age. The book asserts that this art was revealed by the Creator by means of an angel to King Solomon.

It contains a collection of prayers (some of them divided in several parts) mixed with kabbalistic and magical words in several languages (i.e. Hebrew, Greek, etc., and some inventions), how the prayers must be said, and the relation that these rituals have to the understanding of all sciences. It mentions the aspects of the Moon in relation with the prayers. It also says that the prayers act as an invocation to God's angels. According to the book, the correct spelling of the prayers gives the knowledge of the science related to each one and also a good memory, stability of mind, and eloquence. This chapter prevents on the precepts that have to be observed to obtain a good result.

One of the prayers, said to have been called Artem Novam (in Latin) by King Solomon, makes mention to Jesus. Other prayers mention God Father, his son Jesus, and the Holy Ghost, precisely the Christian Trinity. Another mentions the Apostles and martyrs, and another one the Lord's Prayer.

Finally, it tells how King Solomon received the revelation from the angel.