Stool. may refer to:

• Stool (seat), a type of seat without back support or arm rests
  • Bar stool
  • Footstool
• Stool, feces
  • Human feces, more commonly called "stool"
  • Stool test, the collection and analysis of fecal matter to diagnose the presence or absence of a medical condition
• Stool, a living stump of a tree, capable of producing sprouts or cuttings
• Stool (hieroglyph), an alphabetic uniliteral sign of ancient Egypt

• Golden Stool, throne of kings of the Ashanti people
• Groom of the Stool, the most intimate of an English monarch's courtiers
• Informant, sometimes called a "stool pigeon" or "stoolie"