A corned beef sandwich is a Jewish deli sandwich filled with corned beef, traditionally served with mustard on rye bread with a pickle on the side.

In the United Kingdom, the Jewish dish is known as a salt beef sandwich, and a corned beef sandwich refers to one made with canned corned beef, often served with a sweet, vinegary pickled chutney such as Branston Pickle rather than mustard.^{[citation needed]}

Another variant more common in the United States has sauerkraut, Swiss cheese, and Russian dressing on rye bread grilled and served hot is known as a Reuben sandwich.

In Hong Kong Cha chaan teng cuisine, the corned beef sandwich refers to a variation made with bully beef: the canned beef is broken into minces and mixed with beaten eggs, and the mixture is fried into either a patty similar to egg foo young, or a hash of egg and beef pieces; either which are then sandwiched between bread slices.

A contraband corned beef sandwich on rye bread brought aboard the Gemini 3 spacecraft by John Young resulted in a minor controversy, for the risk posed to the craft and crew by floating crumbs and lingering odors.

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