Celestial Effects is a boutique guitar effects pedal company based in Hudson, Massachusetts, operating as a division of Thermalogic Corporation, an electronics manufacturing firm established in 1971. The company was co-founded by engineer Domenic "Dom" Mancini, who brought over 25 years of experience modifying and building pedals, guitars, and tube amplifiers, and Joe Grein, Thermalogic's Vice President. The name "Celestial Effects" was suggested by Grein's wife, Scarlett Star Featherfoot, setting the tone for the brand's zodiac-themed identity.

The company's flagship product line is the Zodiac Series, a collection of effects pedals each named after an astrological sign. The lineup includes the Taurus Blues Overdrive, Virgo Rock Overdrive, Capricorn Rock Distortion, Scorpio Super Boost, Aquarius Fuzz (notable for its popularity among bass players), Cancer Wah the Fuzz? (a multi-effect pedal combining four effects in one enclosure and one of the brand's bestsellers), Gemini Tremolo/Vibrato, Aries Beast Distortion, and Sagittarius Overdrive and Boost. Each pedal features distinctive artwork by in-house artist Kathleen Donahue.

All Celestial Effects pedals are designed, engineered, and manufactured at the company's Hudson, Massachusetts facility, leveraging Thermalogic's decades of electronic circuit assembly expertise. The pedals are built to military-grade specifications and sold factory-direct through the company's website. Celestial Effects also offers OEM manufacturing and engineering services to other guitar effects companies, providing everything from PCB-only builds to full turnkey production solutions.

Celestial Effects has 6 products cataloged on Equipboard, including Overdrive Effects Pedals, Boost Effects Pedals, and Fuzz Effects Pedals. Their gear is featured by 2 artists, with the strongest followings in Rock and Pop. Notable users include Mark Farner and Ken.