蛋白质体（英语：Proteinoplast, proteoplast, aleuroplast, aleuronaplast），又称造蛋白体、蛋白体，是植物细胞中的一种质粒体，又可细分为白色体的一种，主要功能为保存结晶形式的蛋白质，亦可作为和这些蛋白质相关的酵素反应的部位。

蛋白质体虽在1960、1970年代就被辨认出来，人们对它的认识却非常少，甚至尚不确定它是不是特化的保存胞器，如同淀粉体之于淀粉和油粒体之于脂质，一本写于2007年的书提到过去25年来没有任何一篇发表的论文提到蛋白质体。

Proteinoplasts (sometimes called proteoplasts, aleuroplasts, and aleuronaplasts) are specialized organelles found only in plant cells. Proteinoplasts belong to a broad category of organelles known as plastids. Because they lack pigment, proteinoplasts are more specifically a kind of leucoplast. They contain crystalline bodies of protein and can be the sites of enzyme activity involving those proteins. Proteinoplasts are found in many seeds, such as brazil nuts, peanuts and pulses. Although all plastids contain high concentrations of protein, proteinoplasts were identified in the 1960s and 1970s as having large protein inclusions that are visible with both light microscopes and electron microscopes.