红胸长扁铁甲虫（学名：Brontispa longissima）为金花虫科凸额扁铁甲虫属下的一个种。

Brontispa longissima (known as the coconut leaf beetle, the two-coloured coconut leaf beetle, or the coconut hispine beetle) is a leaf beetle that feeds on young leaves and damages seedlings and mature coconut palms. It has become an increasingly serious pest of coconuts throughout various growing regions in the Pacific, especially over the last 3 decades, including Indonesia, Solomon Islands, Vietnam, Nauru, Cambodia, Laos, Thailand, Maldives, Myanmar, Hainan Island, and Aru Islands, and most recently, the Philippines.