Nicholas of Kues (1401 – August 11, 1464), also referred to as Nicolaus Cusanus and Nicholas of Cusa, is a cardinal of the Catholic Church from Germany (Holy Roman Empire), a philosopher, theologian, jurist, mathematician, and an astronomer.

He makes spiritual and political contributions in European history, a notable example of which is his mystical or spiritual writings on 'learned ignorance', as well as his participation in power struggles between Rome and the German states of the Holy Roman Empire.