Brygmophyseter is an extinct genus of toothed whale in the sperm whale family.The genus name is a combination of the greek word brygmos, which means "biting" or "gnashing" and "Physeter" the living sperm whale genus, and derived from the Greek word meaning "blower". This has led to the occasional vernacular term "biting sperm whale" being given to the species. It packed a formidable jaws armed with teeth up to 14 cm (5.5 inches) long. It may have employed sonar to track and disorient a prey item in deep waters, like the modern age sperm whales. It may also have used its large head to ram a potential opponent during conflict. Brygmophyseter likely preyed upon a variety of animals including fish, pinnipeds, giant squid, and other cetaceans.

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