Quat

Quat may refer to:


 * Quat (surname), a Chinese surname
 * Quaternary ammonium cation, a class of chemical molecules used as a disinfectant, surfactant, drug etc.
 * Quaternion, a non-commutative extension of the complex numbers
 * Quaternary (disambiguation), referring to four parts, divisions, or sets.
 * Khat, an African plant whose leaves are chewed as a stimulant
 * Phan Huy Quát, former prime minister of South Vietnam