Quantization of charge is a principle in physics that states that the charge of any object is an integer multiple of the elementary charge, which is the charge of a single electron. This means that any charged particle can have a charge equal to some integral number of e, where e is the elementary charge and n is an integer, i.e., Q = n e, where n=1, 2, 3,…. . The magnitude of the elementary charge is 1.602192 ×10−19 Coulombs.

The quantization of charge is related to the conservation of charges, which means that in nature, the total charge of an isolated system is always conserved. The quantization of electrical charge was first suggested by the experimental laws of electrolysis by Faraday.

The quantization of charge is a fundamental concept in physics and has partially motivated Grand unified Theories. It is also related to the concept of fractional elementary charge, which is observed in quarks, but quarks cannot be isolated, and they exist only in groupings.