Naturalism is a philosophical viewpoint. According to this viewpoint everything arises from natural properties and causes, and supernatural or spiritual explanations are excluded or discounted.

Naturalism may also refer to:

• Naturalism (arts), a style in painting and the visual arts
• Naturalism (literature), a literary style
• Naturalism (theatre), a movement in theatre and drama that began in the 19th century
• Naturalism (philosophy)
  • Ethical naturalism, the theory that ethical statements can be derived from non-ethical statements
  • Spiritual naturalism, spirituality that does not involve the supernatural
  • Religious naturalism, religion that does not include supernatural beliefs