粒突箱鲀（学名：Ostracion cubicus），俗名木瓜，为辐鳍鱼纲鲀形目箱鲀科的其中一种。

本鱼分布于印度太平洋区，包括东非、南非、马达加斯加、毛里求斯、红海、塞舌尔群岛、留尼旺、马尔代夫、圣诞岛、印度、斯里兰卡、缅甸、**、泰国、中国、韩国、日本、菲律宾、越南、泰国、马来西亚、印尼、关岛、库克群岛、新几内亚、澳洲、密克罗尼西亚、马里亚纳群岛、新喀里多尼亚、萨摩亚群岛、东加、瓦努阿图、法属波里尼西亚等海域。该物种的模式产地在印度。

The yellow boxfish (Ostracion cubicus) is a species of boxfish. It can be found in reefs throughout the Pacific Ocean and Indian Ocean as well as the south eastern Atlantic Ocean. It reaches a maximum length of 45 centimetres (18 in).

As the name suggests, it is box-shaped. When juvenile, it is bright yellow in color. As it ages, the brightness fades and very old specimens will have blue-grey coloration with faded yellow. It feeds mainly on algae, but will also feed on sponges, crustaceans and mollusks.