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| Location | 3⁄4 mile (1.2 km) south of the mouth of the St. Johns River, on Naval Station Mayport, Florida |
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| Coordinates | 30°23′10.14″N 81°23′52.8″W / 30.3861500°N 81.398000°W |
| Tower | |
| Foundation | Concrete |
| Construction | Concrete |
| Automated | 1967 |
| Height | 66 feet (20 m) |
| Shape | Square tower with beveled corners |
| Markings | White tower on building |
| Heritage | National Register of Historic Places listed place  |
| Light | |
| First lit | 1954 |
| Focal height | 83 feet (25 m) |
| Lens | Crouse-Hinds 250 kilocandela airway beacon (original), VRB-25 system (current) |
| Range | 19 nautical miles (35 km; 22 mi) |
| Characteristic | Group flashing white 20s |
St. John's Lighthouse | |
| Built | 1954 |
| NRHP reference No. | 100002224 |
| Added to NRHP | March 20, 2018 |
The St. Johns Light is an active lighthouse in Jacksonville, Florida, marking the mouth of the St. Johns River.[1][2][3] Built in 1954, it is located on Naval Station Mayport in the Mayport area. It was erected to replace a lightship, which itself replaced the still-standing Old St. Johns River Light. It is the fourth lighthouse built at the mouth of the St. Johns since 1830. It was listed on the National Register of Historic Places in 2018.