南瓶鼻鲸（学名Hyperoodon planifrons）又称南极瓶鼻鲸和平头鲸。其远不如其近亲北瓶鼻鲸来得有名。牠们似乎从未成为商业捕鲸的对象，也未有任何特定的田野调查。因此，人们对牠们的了解大多来自于对搁浅个体的解剖，或是科学家在调查其他鲸豚时意外的目击记录。已知南瓶鼻鲸仅分布于南半球，但过去在印度洋与太平洋热带海域观察到的“热带瓶鼻鲸”（tropical bottlenose whale）是否就是南瓶鼻鲸，几十年来一直困扰着科学界。虽然这些目击记录外型非常像南瓶鼻鲸，不过有部分学者认为应属他种，可能是难以捉摸的朗氏中喙鲸（Longman's Beaked Whale）。

The southern bottlenose whale (Hyperoodon planifrons) is a species of whale, in the ziphiid family, one of two members of the genus Hyperoodon. Seldom observed and rarely hunted, the southern bottlenose whale is probably the most abundant whale in Antarctic waters. The species was first described by English zoologist William Henry Flower in 1882, based on a water-worn skull from Lewis Island, in the Dampier Archipelago, Western Australia.