立体主义（英语：Cubism）是前卫艺术运动的一个流派，对二十世纪初期的欧洲绘画与雕塑带来革命。

立体主义的艺术家追求碎裂、解析、重新组合的形式，形成分离的画面──以许多组合的碎片型态为艺术家们所要展现的目标。艺术家以许多的角度来描写对象物，将其置于同一个画面之中，以此来表达对象物最为完整的形象。物体的各个角度交错叠放造成了许多的垂直与平行的线条角度，散乱的阴影使立体主义的画面没有传统西方绘画的透视法造成的三度空间错觉，且刻意反抗艺术模仿生活主流思想。背景与画面的主题交互穿插，让立体主义的画面创造出一个二度空间的绘画特色。

Cubism is an early-20th-century avant-garde art movement that revolutionized European painting and sculpture, and inspired related movements in music, literature and architecture. Cubism has been considered the most influential art movement of the 20th century. The term is broadly used in association with a wide variety of art produced in Paris (Montmartre, Montparnasse and Puteaux) during the 1910s and extending through the 1920s.