भिन्न (Fraction) एक संख्या है जो पूर्ण के किसी भाग को दर्शाती है। भिन्न दो पूर्ण संख्याओं का भागफल है। भिन्न का एक उदाहरण है जिसमें 3 अंश कहलाता है और 5 हर कहलाता है।

A fraction represents a part of a whole or, more generally, any number of equal parts. When spoken in everyday English, a fraction describes how many parts of a certain size there are, for example, one-half, eight-fifths, three-quarters. A common, vulgar, or simple fraction consists of an integer numerator, displayed above a line, and a non-zero integer denominator, displayed below that line. If these integers are positive, then the numerator represents a number of equal parts, and the denominator indicates how many of those parts make up a unit or a whole. For example, in the fraction 3/4, the numerator 3 indicates that the fraction represents 3 equal parts, and the denominator 4 indicates that 4 parts make up a whole. The picture to the right illustrates 3/4 of a cake.