| Honorific Prefix: | Father |
| Guillaume Mazeas | |
| Birth Date: | 2 August 1720 |
| Birth Place: | Vannes |
| Death Place: | Vannes |
| Fields: | physics, chemistry, geology |
| Patrons: | Adrien Maurice de Noailles |
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Father Guillaume Mazeas (French: Abbé Guillaume Mazéas; 2 August 1720 – 13 September 1775) was a translator of English scientific works into French, a corresponding member of the French Academy of Sciences and a fellow of the Royal Society.[1] He was canon of the cathedral of Vannes, France.[1] [2] He corresponded with Stephen Hales on scientific matters, including his experiences with the lightning rod invented by Benjamin Franklin.[1] [3] His investigations of red dyeing in the East Indies and their improvement in France were of significant industrial value.[2] [4]