在数学中，中心对称是几何图形的一种性质。

把一个图形绕某一个点旋转180°，如果旋转后的图形与另一个图形重合，那幺这两个图形成中心对称。这个点称为对称中心。

若有对称中心，待定使成立，则为其对称中心。

例如

，对称中心为

In crystallography, a point group which contains an inversion center as one of its symmetry elements is centrosymmetric. In such a point group, for every point (x, y, z) in the unit cell there is an indistinguishable point (-x, -y, -z). Such point groups are also said to have inversion . Point reflection is a similar term used in geometry. Crystals with an inversion center cannot display certain properties, such as the piezoelectric effect.