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| Big Muff Pi | |
|---|---|
 Big Muff Pi NYC Reissue Version | |
| Manufacturer | Electro-Harmonix and Sovtek |
| Dates | 1969 – present |
| Technical specifications | |
| Effects type | Fuzz |
| Hardware | Analog |
| Controls | |
| Input/output | |
| Inputs | mono |
| Outputs | mono |
The Big Muff Pi (π), often known simply as the Big Muff, is a "fuzzbox" effects pedal produced in New York City by the Electro-Harmonix company, along with their Russian sister company Sovtek, primarily for use with the electric guitar. It is used by bassists as well, due to the Big Muff's squeaky frequency response.