Thorne Bay Seaplane Base (IATA: KTB, FAA LID: KTB) is a state-owned public-use seaplane base serving Thorne Bay, a community in the Prince of Wales-Hyder Census Area of the U.S. state of Alaska.

As per Federal Aviation Administration records, the airport had 2,640 passenger boardings (enplanements) in calendar year 2008, 2,283 enplanements in 2009, and 2,608 in 2010. It is included in the National Plan of Integrated Airport Systems for 2011–2015, which categorized it as a non-primary commercial service airport (between 2,500 and 10,000 enplanements per year).