| Aloysius Masnata S.J. | |
| Order: | 6th |
| President of Santa Clara University | |
| Term Start: | 1868 |
| Term End: | 1876 |
| Predecessor: | Aloysius Masnata, S.J. |
| Successor: | Aloysius Brunengo, S.J. |
| Birth Date: | March 9, 1830 |
| Birth Place: | Cagliari, Sardinia |
| Death Place: | Santa Clara, California |
| Alma Mater: | University of Paris |
| Profession: | Jesuit priest |
Rev. Aloysius Varsi, SJ, (9 March 1830 – 27 November 1900) was an American educator and college president.
Varsi was born in Cagliari, Sardinia, and entered the Society of Jesus, an order of the Roman Catholic Church, on May 2, 1845. He was educated at St. Teresa's College in Cagliari, and he went to Turin, Toulouse and Vals for advanced training in literature and philosophy. Shortly afterward, he continued studies of physics and higher mathematics at the University of Paris.
In 1861, Varsi sailed to the United States and studied theology in Boston, Massachusetts, where he also taught physics and chemistry. He moved to California in 1865 and took up a professorship in physics at Santa Clara College; two years thereafter he was assigned the presidency (1868–1876). During his tenure, the original chapel was destroyed in an earthquake, and a large new theatre building, Exhibition Hall, replaced the old edifice.
After 1876, Varsi was assigned to St. Ignatius College in San Francisco, where he became the superior of the California Mission, (similar to a province), and constructed the first college buildings, including St. Ignatius Church, many of which were destroyed in the 1906 earthquake. He died in San Francisco in 1900 making front-page news all around the world.