Makaira (Latin via Greek: μαχαίρα "sword") is a genus of marlin in the Istiophoridae family. It includes the Atlantic blue, and Indo-Pacific blue marlins. In the past, the black marlin was also included in this genus, but today it is placed in its own genus, Istiompax.
- Makaira nigricans Lacepède, 1802 (Atlantic blue marlin)
- Makaira mazara (Jordan & Snyder, 1901) (Indo-Pacific blue marlin)
Although they are traditionally listed as separate species, recent research indicates that the Atlantic blue marlin (Makaira nigricans) and Indo-Pacific blue marlin (Makaira mazara) may be parapatric populations of the same species.