Gastineau Peak is a mountain in the city and borough of Juneau, Alaska, United States.

It is a part of the Boundary Ranges of the Coast Mountains in western North America.

The name was already in use and noted by United States Geological Survey (USGS) official D. C. Witherspoon in 1916 and first published in 1918.

It was entered into the USGS's Geographic Names Information System on March 31, 1981.

This article about a location in the City and Borough of Juneau, Alaska is a stub.