Miami Seaplane Base (IATA: MPB, FAA LID: X44) is a public-use seaplane base located 2 miles (3.2 km) east of the central business district of Miami on Watson Island in Miami-Dade County, Florida, United States. The seaplane base was established by Chalks in 1926 and continues to be owned and operated by such.

In 1926, Chalk's International Airlines built an air terminal on a landfill island, Watson Island, where it continued to operate for over 75 years. Its scheduled and other flights by flying boats and amphibian aircraft served many points in the Bahamas and other nearby destinations.

Chalk's moved its flights to its main engineering and operating base at Fort Lauderdale-Hollywood International Airport after the attacks of September 11, 2001, because of security concerns around the Port of Miami-Dade and increased helicopter traffic around Watson Island.

As of August 8, 2016, Cape Air operates two daily non-stop scheduled commercial seaplane flights between the Miami Seaplane Base at Watson Island and the Bimini Seaplane Base at Resorts World Bimini, North Bimini Island.

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