Into Eternity is a 2010 Danish documentary film directed by Michael Madsen, released in 2010. It follows the construction of the Onkalo waste repository at the Olkiluoto Nuclear Power Plant on the island of Olkiluoto, Finland. Director Michael Madsen questions Onkalo's intended eternal existence, addressing an audience in the remote future.

Into Eternity raises the question of the authorities' responsibility of ensuring compliance with relatively new safety criteria legislation and the principles at the core of nuclear waste management.

When shown on the British More4 digital television channel on 26 April 2011, the name Nuclear Eternity was used. It received a special mention in the Sheffield Green Award at Sheffield Doc/Fest in 2010.