Eternity and a Day (Greek: Μια αιωνιότητα και μια μέρα, Mia aioniótita kai mia méra) is a 1998 Greek drama film directed by Theo Angelopoulos, and starring Bruno Ganz, Isabelle Renauld and Fabrizio Bentivoglio.

The film won the Palme d'Or and the Prize of the Ecumenical Jury at the 1998 Cannes Film Festival. It was selected as the Greek entry for the Best Foreign Language Film at the 71st Academy Awards, but was not accepted as a nominee.