| Gregorio Fontana | |
| Birth Date: | 1735 12, df=yes |
| Birth Place: | Nogaredo, Italy |
| Death Place: | Milan, Italy |
| Nationality: | Italian |
| Field: | Geometry |
| Known For: | polar coordinates |
| Notable Students: | Pietro Paoli |
Gregorio Fontana, born Giovanni Battista Lorenzo Fontana (7 December 1735 – 24 August 1803) was an Italian mathematician and a religious of the Piarist order. He was chair of mathematics at the university of Pavia succeeding Roger Joseph Boscovich. He has been credited with the introduction of polar coordinates.[1] [2]
His brother was the physicist Felice Fontana (1730–1805).