Adam Marian Dziewoński (November 15, 1936 – March 1, 2016) was a Polish-American geophysicist who made seminal contributions to the determination of the large-scale structure of the Earth's interior and the nature of earthquakes using seismological methods.

He extended the radial Earth models to be fully three-dimensional, along the way mapping and interpreting four "grand" structures.

The two other features are large-scale regions of slower-than-average wavespeed, inferred to be hot and rising superplumes, located at the bottom of the mantle under the middle of the Pacific Ocean and Africa.

His other research direction systematically determined the orientation and magnitude of the deformation for most of the significant earthquakes that have been well-recorded.

These results are known as the Harvard CMTs (centroid moment tensor solutions) and are continued today at Lamont–Doherty Earth Observatory by Göran Ekström and Meredith Nettles as the Global CMT Project.