- A&A Astronomical and Optical Instruments Ltd.
 - Carries a wide range of telescopes including reflector and refractor types. Also offers binoculars, spotting scopes, and accessories. - Advanced Telescope Systems
- Manufacturing portable telescope piers and custom telescope accessories for amateur astronomers.
- Agena AstroProducts
- Online reseller of astronomical telescopes, binoculars, and related observing accessories and books.
- Apogee Instruments
- High performance astronomical CCD imaging.
- Astronomics/Christophers, Ltd.
- Mail order retailer of astronomical telescopes and accessories, CCD equipment, and birdwatching and nature study binoculars and spotting scopes.
- Astroshops
- Offers telescopes, binoculars, software, books, and other astronomy products. Search by price, lens, or size. Includes buying guide, astrophotography images, news, articles, and more.
- Banet Associates
- Offers parts and star machine control systems as well as maintenance, refurbishment, and planetarium technical support.
 Bray Imaging
- Retailer of astronomical telescopes, binoculars, and accessories including eyepieces, mounts, tripods, guidescopes, filters, and prisms.- Celestron
- Offers a wide range of telescopes, binoculars, spotting scopes, and optical accessories.
- Company Seven Astro-Optics Division
- Offers a selection of astronomy services and products. Also contains information on astronomy and astrophotography.
- Cutler of New England
- Maker of collectible, hand-built telescopes.
- David Hinds Ltd
- Specialists in astronomical equipment, including telescopes and binoculars.
- DTA Scientific Instruments
- Provides CCD cameras, XY controllers, telescope controllers, filter wheels, and photometers.
- Glass Eye, The
- Specialises in brass, custom, all weather, and hand-held telescopes.
- Guan Sheng Optical Co., Ltd.
- Manufacturers of telescopes, eyepieces, and accessories.
- Hands on Optics
- Sells astronomy telescopes, Celestron spotting scopes, Pentax eyepieces, digital binoculars, and accessories.
- Hollywood General Machining, Inc.
- Offering Losmandy telescope mounts and accessories.
- Metal Planet
- Online factory store stocked with the BC&F Astro Engineering range of British custom-made astronomical accessories.
- Mountain Instruments
- Makes fork and German equatorial telescope mounts. Additional services include telescope restoration and custom work.
- Opticmall
- Sells binoculars and telescopes directly from the factory floor.
- Orion Optics Ltd
- Manufacturers of astronomical telescopes, and U.K. distributors of reflectors and refractors, filters, eyepieces, CCD photo equipment, and more.
- Parallax Instruments
- Custom telescopes, mounts, and mounting rings made to order with optional
- ProtoStar Astronomy Products
- Advanced engineered products for the amateur astronomer.
- Roger W. Tuthill, Inc.
- Telescope distribution and sales and Tuthill telescope accessory manufacturing and sales.
- SBIG Astronomical Instruments
- SBIG Online has the latest software and information for users of SBIG's CCD cameras.
- Scopes 'N' Skies
- Binoculars, telescopes, and related accessories for birdwatching and astronomy. Find great deals on brand name products.
- Sherwoods
- U.K. retailer of telescopes, binoculars, and accessories. Sherwoods offers low prices and excellent service for a wide range of optics.
- Sky Valley Scopes
- Offers custom built telescopes for amateur astronomers, and wood veneer and fibreglass tubes for amateur telescope makers.
- SkyOptics.com
- Telescopes, binoculars, spotting-scopes and rifle-scopes.
- SkyScopes
- Offers telescopes, binoculars, lenses and related products. Also includes astronomy-related information, photographs, and message board.
- Stellar Views
- Selling refractors, Dobsonain telescopes, accessories and more.
- Stellarvue
- Produces telescopes and binoculars for astronomy, birdwatching, and nature study. Also provides astronomy courses, including a summer astronomy camp held in the High Sierra.
- Telescope Store, The
- Offers astronomical telescopes, accessories, and binoculars. Includes a guide for selecting telescopes.
- Telescopes Company, The
- Offers a range of name brand reflecting and refracting telescopes and related accessories for amateurs and professionals.
- Telescopes for Less
- Specialising in telescopes, binoculars, and accessories.
- Thousand Oaks Optical
- Provides solar, nebular, and H - alpha filters and eclipse viewers.
- TL Systems
- Binocular viewer & equatorial platform for astronomy and telescope enthusiasts.
- Woodland Hills Camera & Telescopes
- Retailer and online store stocks a large selection of telescopes, binoculars, night vision, spotting scopes, and accessories.
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