本氏蝴蝶鱼，又称双丝蝴蝶鱼，俗名本氏蝶，为辐鳍鱼纲鲈形目蝴蝶鱼科的其中一种。

本鱼分布于印度太平洋区，包括东非、亚丁湾、马尔代夫、科摩罗、毛里求斯、塞舌尔群岛、斯里兰卡、菲律宾、印尼、中国南海、日本、**、越南、新几内亚、所罗门群岛、澳洲、马里亚纳群岛、马绍尔群岛、密克罗尼西亚、帕劳、瑙鲁、斐济群岛、夏威夷群岛、法属波里尼西亚、复活节岛、加拉巴哥群岛、东加、基里巴斯、图瓦卢、万纳杜、萨摩亚群岛、厄瓜多尔、墨西哥等海域。

The bluelashed butterflyfish, Chaetodon bennetti, is a species of butterflyfish (family Chaetodontidae). It is found in the Indo-Pacific from East Africa to the Pitcairn Islands, north to Japan and south to Lord Howe Island and Rapa Iti.

It grows to a maximum of 20 cm (almost 8 in) long. The body is yellow with a black patch surrounded by a blue circle below the dorsal fin and two curved blue lines above the belly. Its vertical black eyestripe is flanked by two blue lines.