Hyder Seaplane Base (IATA: WHD, FAA LID: 4Z7) is a state owned, public use seaplane base located one nautical mile (2 km) southeast of the central business district of Hyder,[1] a community in the Prince of Wales-Hyder Census Area of the U.S. state of Alaska.

It is included in the National Plan of Integrated Airport Systems for 2011–2015, which categorized it as a general aviation facility.

For the 12-month period ending December 31, 2006, the airport had 105 aircraft operations, an average of 8 per month: 95% air taxi and 5% general aviation.

[1] There are two floats for seaplanes, one along the shoreline and another within a protected cove with a concrete launch ramp.

The Hyder Seaplane Base uses Pacific Time Zone for e.g. flight schedule as is done in western Canada and in general in Hyder,[4] but different from the rest of Alaska which uses Alaska Time Zone.