Jack Browns Seaplane Base (FAA LID: F57) is a public-use seaplane base located 3 nautical miles (5.56 km) northwest of the central business district of Winter Haven in Polk County, Florida, United States.

The privately owned[1] seaplane base is located adjacent to Winter Haven's Gilbert Airport and connected to it by an asphalt taxiway.

Jack Browns Seaplane Base covers an area of 8 acres (3.2 ha) at an elevation of 140 feet (42.7 m) above mean sea level.

[1] For the 12-month period ending November 17, 2009, the airport had 10,000 general aviation aircraft operations, an average of 27 per day.

At that time there were 5 aircraft based at this airport: 80% single-engine and 20% multi-engine.