Margaret Harwood (March 19, 1885 – February 6, 1979)[1] was an American astronomer specializing in photometry and the first director of the Maria Mitchell Observatory in Nantucket, Massachusetts.

In 1907 she received her Bachelor's Degree in Astronomy (AB) from Radcliffe College, where she was a member of Phi Beta Kappa.

Her specialty, photometry, involved measuring variation in the light of stars and asteroids, and she applied it particularly to that of the small planet 433 Eros, which was discovered during her time with the Harvard Observatory.

[6] At the time, "senior people around her advised her not to report it as a new discovery because it was inappropriate that a woman should be thrust into the limelight with such a claim".

After her retirement from the Maria Mitchell Observatory in 1957, she was awarded a Graduate Chapter Medal from her alma mater Radcliffe College to commemorate her achievements in astronomy.