Parallel could mean:
- Parallel (geometry), as in "parallel lines"
- Circle of latitude, an imaginary east-west line circling a globe, e.g. the 38th parallel
- Parallelism (grammar), a balance of two or more similar words, phrases, or clauses
- Parallel study, a type of clinical study
- Parallel circuit, as opposed to series
- Parallel import, also known as a "grey market product"
- Parallel transport, in mathematics using vectors and smooth curves
In music:
- Parallel key, the minor (or major) key of a major (or minor) key with the same tonic
- Harmonic parallelism, also known as "harmonic planing" or "parallel voice leading"
- Parallel fifths, also known as "consecutive fifths", involve the concurrence of successive intervals of a perfect fifth between two voices in parallel motion -- a harmonization generally forbidden in modern musical theory
Other:
- Parallel (manga) (ぱられる) is a shōnen manga by Toshihiko Kobayashi
- Parallel 9, A British children's television show
