Cardinality (disambiguation)

Cardinality may refer to:


 * Cardinality of a set, a measure of the "number of elements" of a set in mathematics
 * Cardinality of a musical set, the number of pitch classes
 * Cardinality (data modeling), a term in database design, e.g. many-to-many or one-to-many relationships
 * Cardinality (SQL statements), a term used in SQL statements which describes the "uniqueness" of the data in a given column
 * Cardinal utility, in contrast with ordinal utility, in economics