San Juan (Uganik) Seaplane Base (IATA: UGI, FAA LID: WSJ) is a public use seaplane base located in San Juan (Uganik), in the Kodiak Island Borough of the U.S. state of Alaska. It is privately owned by the San Juan Fishing & Packing Co.

Scheduled passenger service to Kodiak, Alaska, is subsidized by the United States Department of Transportation via the Essential Air Service program.