| Birthname: | Mariano Rosati |
| Nationality: | Italian |
| Office: | Italian Senator from Lombardy |
| Party: | Christian Democracy |
| Constituency: | Como |
| Term Start: | May 8, 1948 |
| Term End: | June 24, 1953 |
| Preceded: | None |
| Succeeded: | Title jointly held |
| Birth Date: | 12 December 1869 |
| Birth Place: | Como, Lombardy |
| Profession: | Lawyer |
Mariano Rosati was a member of the Italian Christian Democracy, and was an Italian Senator from Lombardy. He did not seek for re-election in 1953.
His daughter Anna Maria Rosati, born on May 4, 1905, is still alive and is therefore among the supercentenarians.
Rosati was the chairman of the association of the lawyers of the Province of Como. In 1948 he was nominated for the Senate by the DC despite not being a member of the party, but he joined it after his victory. Not being a politician, he retired in 1953.