贝氏喙鲸，学名Berardius arnuxii，旧称贝尔氏喙鲸，有时又被称为巨瓶鼻鲸，北太平洋瓶鼻鲸，巨四齿鲸，北太平洋四齿鲸以及北方四齿鲸。牠们是目前世界上最大的现生种喙鲸。1881年，俄罗斯一位地方首长Nicholas Grebnitzki在白令海发现未知的大型喙鲸头骨，之后由学者Leonard Stejneger在1883年时提出学名。牠们一度曾被视为其近亲阿氏贝喙鲸(Berardius arnuxii)的北方变种，直到1910年学者True F.在论文中提出完整样本观察报告，确认两者是独立的两个物种。在日本外海，由于其庞大的体型且常在岸边出现，使之成为商业捕鲸的目标，特别是在日本的千叶县（chiba），贝氏喙鲸极具商业价值，多以新鲜鲸肉或肉干贩售。贝氏喙鲸在日本被称为“tsuchi-kujira”（假名写作“ツチクジラ”，汉字为“槌鲸”），“tsuchi”是一种形状像瓶子的老式木槌，“kujira”意思是“鲸”。与其他喙鲸相同，贝氏喙鲸生存于较深的海域，对研究工作而言是一大挑战。一直以来对牠们的研究主要来自于解剖日本捕捉到、或随后在市场上贩售的样本。

Giant beaked whales are two species of beaked whales in the genus Berardius: Arnoux's beaked whale (Berardius arnuxii) in cold Southern Hemisphere waters, and Baird's beaked whale (Berardius bairdii) in the cold temperate waters of the North Pacific. They are the largest of the beaked whales, growing up to 10–12 m in length. They are sometimes referred to as "four-toothed whales" or "giant beaked whales", but are most commonly known by their genus name, Berardius. Arnoux's and Baird's beaked whales are so similar that researchers have debated whether or not they are simply two populations of the same species. However, genetic evidence and their wide geographical separation has led them to be classified as separate.