木本植物是一类植物的总称，指植物的茎内木质部发达，质地坚硬的植物，但并非生物分类学中植物的一个单元。一般直立、寿命长，能多年生长，与草本植物相对，人们常将前者称为树，后者称为草。

木本植物依形态不同，分乔木、灌木、木质藤本。

木本植物是木材的来源，均为多年生植物。另外除买麻藤纲外所有裸子植物均属于木本植物、笔筒树是仅有的蕨类木本植物。

A woody plant is a plant that produces wood as its structural tissue. Woody plants are usually either trees, shrubs, or lianas. These are usually perennial plants whose stems and larger roots are reinforced with wood produced from secondary xylem. The main stem, larger branches, and roots of these plants are usually covered by a layer of bark. Wood is a structural cellular adaptation that allows woody plants to grow from above ground stems year after year, thus making some woody plants the largest and tallest terrestrial plants.