| John S. Heermans | |
| Office: | Member of the Florida House of Representatives from St. Lucia County |
| Term Start: | 1852 |
| Term End: | 1853[1] |
| Office2: | Member of the Florida House of Representatives from Brevard County |
| Term Start2: | 1856 |
| Term End2: | 1860 |
| Predecessor2: | None |
| Successor2: | Needham Yates |
| Birth Date: | 7 June 1790[2] |
| Birth Place: | Saugerties, New York |
| Death Place: | Florida |
| Restingplace: | Key West Cemetery, Key West, Florida |
| Residence: | Susannah, Florida |
John S. Heermans (June 7, 1790 – February 17, 1865) was a member of the Florida House of Representatives from St. Lucia County in the 1852 session, and after the county changed its name, from Brevard County in the sessions of 1856, 1858, and 1859. He had also served as a county commissioner for St. Lucia County in 1852. He served as a probate judge in 1851, and from 1853 to 1855.
He served on a committee for the defense of the state during the American Civil War.