Corned beef sandwich is a popular food item that is traditionally consumed on St. Patrick's Day. It is both Irish and American, since it is believed that the sandwich was first popularized in New York by Irish immigrants during the early 20th century.

Typically, it consists of sliced corned beef between two slices of (usually rye or sourdough) bread, but there are numerous variations of the sandwich with added cabbage, mustard, cheese, or pickles.