Octave may refer to:
- Octave (poetry), the first eight lines of a sonnet
- Sicilian octave, a distinct poetic form
- Ottava rima, an Italian verse form
- Octave (music), the interval between one musical pitch and another with half or double its frequency.
- Octave (album), an album by The Moody Blues
- The Octāves, an all-male a cappella group from the University of Richmond
- Octave Chanute, French-born American railway engineer and aviation pioneer.
- Octave Levenspiel, American professor of chemical engineering.
- Octave Mirbeau, French journalist.
- Octave Tassaert, French painter.
- GNU Octave, a program for performing numerical analysis, mostly compatible with MATLAB
- Octave (electronics) a doubling or halving of frequency, in physics and engineering
- Electromagnetic radiation can be divided into eighty-one octaves
- "The Law of Octaves" is a concept from the history of the development of the Periodic Table of Chemical Elements (see John Newlands or Mendeleev)
- an early term for octonion in algebra
- Octave celebration, a major religious celebration in Luxembourg
- Octave (horse), a champion graded stakes race thoroughbred racehorse
- Octave (liturgical), an eight-day feast in the liturgical sense, especially in the Roman Catholic tradition
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