New York's Metropolitan Museum of Art and the Italian Ministry of Culture are set to sign an agreement on Tuesday for the return of six antiquities to Italy.
Italian officials say the works were looted.
Under the agreement, Italy is expected to provide long-term loans of equivalent works of art to the Met.
One of the works to be returned is a sixth century B.C. vase, called the Euphronios Krater said to be one of the finest examples of its kind.
Tomb raiders have looted antiquities in Italy for centuries and Rome says some have ended up on display abroad.
Italy has recently stepped up a campaign to return important artworks. Some information for this report was provided by AFP, AP and Reuters.