Russian Ark (Russian: Русский ковчег, romanized: Russkij kovcheg) is a 2002 experimental historical drama film directed by Alexander Sokurov. The plot follows an unnamed narrator, who wanders through the Winter Palace in Saint Petersburg, and implies that he died in some horrible accident and is a ghost drifting through. In each room, he encounters various real and fictional people from various periods in the city's 300-year history. He is accompanied by "the European", who represents the Marquis de Custine, a 19th-century French traveler.

An international co-production between Russia and Germany, Russian Ark was shot entirely in the Winter Palace of the Russian State Hermitage Museum on 23 December 2001, using a one-take single 87-minute Steadicam sequence shot. It extensively uses the fourth wall device, but repeatedly broken and re-erected. At times, the narrator and the companion interact with the other performers, while at other times they pass unnoticed.

The film was entered into the 2002 Cannes Film Festival. Russian Ark is widely regarded as one of the greatest Russian films of all time.