Spectra (singular spectrum) are conditions or values that vary over a continuum.
Spectra may also refer to:
- Kia Spectra, a car developed by Kia Motors from 2000–present
- Optare Spectra, a bus body built by Optare
- Spectra, journal of the Museum Computer Network (MCN)
- Spectra Energy, an American company that was spun out of Duke Energy
- Spectra, a brand name of ultra-high-molecular-weight polyethylene (UHMWPE) fiber
- Spectra Marine, a recreational power boat
- SPECTRA helmet, a ballistic helmet made of Dyneema
- Spectra Marketing, part of the Homescan business, owned by the Nielsen Company
- Spectra Merchandising International Inc., a privately owned Chicago-based designer and supplier of consumer electronics to companies such as Jensen Electronics
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