The Reuben sandwich is a North American grilled sandwich composed of corned beef, Swiss cheese, sauerkraut, and Russian dressing or Thousand Island dressing, grilled between slices of rye bread. It is associated with kosher-style delicatessens but is not kosher, as it combines meat and cheese.

A sandwich is a food typically consisting of vegetables, sliced cheese or meat, placed on or between slices of bread, or more generally any dish wherein bread serves as a container or wrapper for another food type. The sandwich began as a portable, convenient finger food in the Western world, though over time it has become prevalent worldwide.