Anna Sofaer (born November 20, 1940) is an American researcher and educator on the archaeoastronomy of the Ancestral Puebloans of the American Southwest and other ancient cultures. In 1977, she "rediscovered" the astronomical marker site known as the Sun Dagger on Fajada Butte in Chaco Culture National Historical Park. Research has indicated this site records the solar and lunar cycles.
In 1978, she founded the non-profit Solstice Project, through which she has produced a book of peer-reviewed research papers and two documentary, PBS broadcast films on Chaco Canyon. She continues to produce research and films from Santa Fe, New Mexico, where the Solstice Project is based.