Multiplicity may refer to:

• Multiplicity (film), a 1996 comedy film starring Michael Keaton
• Multiplicity (album), 2005 studio album by Dave Weckl

• Multiplicity (chemistry), multiplicity in quantum chemistry is a function of angular spin momentum
• Multiplicity (informatics), a type of relationship in class diagrams for Unified Modeling Language used in software engineering
• Multiplicity (mathematics), the number of times an element is repeated in a multiset
• Multiplicity (software), a software application which allows a user to control two or more computers from one mouse and keyboard
• Multiplicity (statistical mechanics), the number of microstates corresponding to a particular macrostate in a thermodynamic system, symbolized by the Greek letter Ω
• Dissociative identity disorder, psychological condition formerly called "multiple personality disorder" where a person exhibits multiple, distinct overlapping identities
• Statistical multiplicity, also known as the problem of multiple comparisons

• Multiplicity (Christianity)
• Multiplicity (philosophy), a philosophical concept
• Multiplicity (subculture), an online subculture of people who identify as having multiple personalities, some of whom are diagnosed with dissociative identity disorder

• All pages with titles containing Multiplicity