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() is a census-designated place (CDP) in the Valdez-Cordova Census Area in the Unorganized Borough of the U.S. state of Alaska. As of the 2000 census, the population of the CDP was 554.
Glennallen is located in the continental climate zone, with long, cold winters, and relatively warm summers. The mean temperature in January is -10°F (-23°C); in July, 56°F (13°C). However, temperatures can reach -50°F (-46°C) in winter and 80°F (27°C) in summer. Snowfall averages 39 inches (1 m), with total precipitation of 9 inches (23 cm) per year.