The Fortress of Solitude is the occasional headquarters of Superman in DC Comics. Its predecessor, Superman's "Secret Citadel", first appeared in Superman #17, where it was said to be built into a mountain on the outskirts of Metropolis. However, the formal introduction of the Fortress took place in the story "The Super-Key to Fort Superman", published in Action Comics #241 (June 1958).

Traditionally, the Fortress of Solitude is located in the Arctic, though more recent versions of the Superman comics have placed the Fortress in other locations, including the Antarctic, the Andes and the Amazon rainforest. The general public in Superman's world is either unaware or at best only vaguely aware of the existence of the Fortress, with its location kept secret from all but Superman's closest friends and allies (such as Lois Lane and Batman). A trademark of the Fortress is that it contains a memorial statue of Jor-El and Lara, Superman's Kryptonian parents, holding a large globe of Krypton.

Although Superman has living quarters at the Fortress, his main residence is still his apartment in Metropolis. The original Silver Age Fortress, first appearing in 1958, was located in the Arctic and built into the side of a steep cliff. The Fortress was accessible through a large gold-colored door with a giant keyhole, which required an enormous key to open it.

The arrow-shaped key was so large that only Superman (or another Kryptonian such as Supergirl) could lift it; when not in use, the key sat on a perch outside of the Fortress, where it appeared to be an aircraft path marker. This was until a helicopter pilot followed the direction of the arrow straight to the entrance of the Fortress, forcing Superman to develop a mirage-ray to camouflage the entrance and key and to ensure the Fortress's secrecy.

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