Monad may refer to:
- Monad (symbol) a term used by ancient philosophers Pythagoras, Parmenides, Xenophanes, Plato, Aristotle, and Plotinus as a term for God or the first being, or the totality of all being.
- Monism, the concept of "one essence" in the metaphysical and theological theory
- Monad (Gnosticism), the most primal aspect of God in Gnosticism
- Monadology, a book of philosophy by Gottfried Leibniz in which monads are a basic unit of perceptual reality
- Monadologia Physica by Immanuel Kant
- The Cup or Monad, a text in the Corpus Hermetica
In mathematics and computer science:
- Monad (music), a single note, in contradistinction to a dyad, triad, tetrad, etc
In proper names and popular culture:
- Monad (Technocracy), the symbol of Technocracy Incorporated and the Technocratic movement of North America
- Windows PowerShell, a command line interface for Microsoft Windows code-named "Monad"
- Xmonad, a window manager for the X Window System
- John Monad, title character of the television series John from Cincinnati