The James Dwight Dana House, also known as the Dana House, is a historic 19th-century Italianate house at 24 Hillhouse Avenue in New Haven, Connecticut, in the United States. This building, designed by New Haven architect Henry Austin, was the home of Yale University geology professor James Dwight Dana (1813–95). It was declared a National Historic Landmark in 1965 for its association with Dana, who produced the first published works emphasizing that the study of geology was a much broader discipline than the examination of individual rocks.

Hillhouse Avenue is a street in New Haven, Connecticut, famous for its many nineteenth century mansions, including the president's house at Yale University. Both Charles Dickens and Mark Twain have described it as "the most beautiful street in America." Much of the avenue is included in the Hillhouse Avenue Historic District, which extends to include houses on adjacent streets.