Swordfish (Xiphias gladius), also known as broadbills in some countries, are large, highly migratory predatory fish characterized by a long, flat, pointed bill. They are a popular sport fish of the billfish category, though elusive. Swordfish are elongated, round-bodied, and lose all teeth and scales by adulthood.

Swordfish are purplish blue in color. The sword is almost black. Unlike most fishes, the adult swordfish does not have scales. It also does not have teeth. The swordfish has a powerful body that is shaped like a torpedo. Its sword is actually a bony extension of the top jaw. The swordfish eats smaller fishes and squid.

The swordfish, an elongated, scaleless fish, has a tall dorsal fin, and a long sword, used in slashing at prey fishes, extends from its snout. The sword is flat, rather than rounded as in marlins and other spear-nosed fishes, and has thus given rise to the name broadbill. The swordfish is also distinguished by its lack of pelvic fins and of teeth.

Swordfish have a brownish-black back and light underside. They have a tall first dorsal fin and distinctly forked tail. They can grow to a maximum length of over 14 feet and weight of 1,400 pounds. Females are larger than males. While young swordfish have spines and small teeth, adults do not have scales nor teeth.