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Period (from Greek περίοδος) or periodic may refer to:
- Period, the time taken for one full oscillation; see on frequencies
- Orbital period, the time for one object to complete an orbit around another
- Period (periodic table), a horizontal row of the periodic table
- Period, euphemism for menstruation, the periodic discharge of blood and mucosal tissue (the endometrium) from the uterus and vulva
- 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 (punctuation), a punctuation mark indicating the end of a sentence or phrase, specifically, a dot.
- Period piece, a creative work set in a particular era
- Period (music), a concept in musical composition
- Period, the final book in Dennis Cooper's George Miles cycle of novels
- Period (school), a class period in schools
- Periods in ice hockey; see Ice hockey § Periods and overtime
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