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Period may refer to:
- Era, a length or span of time
- Full stop (or period), a punctuation mark
- Menstruation, also called a "period"
Science and mathematics
- Unit of time
- Period (physics), the duration of time of one cycle in a repeating event
- Orbital period, the time needed for one object to complete an orbit around another
- Period (periodic table), a horizontal row of the periodic table
- Period (gene), a gene in Drosophila involved in regulating circadian rhythm
- Period (geology), a subdivision of geologic time
- Periods (ring), members of the ring of numbers that can be expressed as integrals of algebraic differential forms over algebraically defined domains
- Period (music), a concept in musical composition
- Period, the final book in Dennis Cooper's George Miles cycle of novels
- Period (school), a class meeting time in schools
- Periods in ice hockey; see Ice hockey#Periods and overtime
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