Lagenorhynchus is a genus in the order cetacea containing six closely related species. These are

• the White-beaked Dolphin, Lagenorhynchus albirostris
• the Atlantic White-sided Dolphin, Lagenorhynchus acutus
• the Pacific White-sided Dolphin, Lagenorhynchus obliquidens
• the Dusky Dolphin, Lagenorhynchus obscurus
• the Black-chinned Dolphin, Lagenorhynchus australis
• the Hourglass Dolphin, Lagenorhynchus cruciger