Port Heiden (Alutiiq: Masrriq) is a city in Lake and Peninsula Borough, Alaska, United States.

Port Heiden has a subarctic climate (Köppen Dfc).

Port Heiden first appeared on the 1880 U.S. Census as the unincorporated Aleut village of "Mashikh.

39.0% of all households were made up of individuals, and 7.3% had someone living alone who was 65 years of age or older.

There were no families and 5.6% of the population living below the poverty line, including no under eighteens and 25.0% of those over 64.