Port Williams Seaplane Base (IATA: KPR, FAA LID: KPR) is a public use seaplane base located in Port Williams (also known as Port William), in the Kodiak Island Borough of the U.S. state of Alaska. Port William is located on the southern tip of Shuyak Island, facing Afognak Island, about 45 miles north of Kodiak.

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