Kanał (Polish pronunciation: [ˈkanaw], Sewer) is a 1956 Polish film directed by Andrzej Wajda. It was the first film made about the Warsaw Uprising, telling the story of a company of Home Army resistance fighters escaping the Nazi onslaught through the city's sewers. Kanał is the second film of Wajda's War Trilogy, preceded by A Generation and followed by Ashes and Diamonds.

It is 25 September 1944, during the last days of the Warsaw Uprising. Lieutenant Zadra leads a unit of 43 soldiers and civilians to a new position amidst the ruins of the Mokotów district.

The composer Michał manages to telephone his wife and child in the German-controlled portion of the city. After a few words, she tells him that the Germans are clearing the building and that they are coming for her. Then the line goes dead. The next morning, 23-year-old Officer Cadet Korab apologizes after walking into a room to find the second in command, Lieutenant Mądry, and messenger girl Halinka in bed. (Halinka later reveals that Mądry is her first lover.) A German attack is beaten off, but Korab is wounded.

Surrounded by the enemy, Zadra is ordered to retreat through the sewers to the downtown district. Now down to 27 fit to travel, including Korab, they slog through the filth.