消色差透镜或复消色差透镜（achromat）是被设计用来将色差和球面像差减至最小的透镜，属于消色差透镜组。

最普通的消色差透镜的形式是双合透镜，这两片透镜分别用两种色散能力不相同的玻璃制成。两个透镜元素被组合在一起，以便一片的色差由另一片来抵消。当冕牌玻璃正透镜的光学倍率不会被燧石玻璃的负透镜抵消时，它们的组合能将不同波长的光一起聚焦在焦长更长的一个焦点上。消色差透镜能让两种不同波长的光聚焦在相同的平面上。

可以相信的是，消色差透镜大约是在1733年由一位名为切斯特·穆尔·霍尔的英国律师发明的。

第一片消色差透镜确实的发明日期并不清楚，也不清楚第一位发明人是谁。依据牛顿在18世纪时对系统可行性理论上的探讨，认为这样的修正是不可能达成的（参见望远镜的历史）。有些概念展示了由水和玻璃制成的透镜，但第一个实用的透镜不知是何时制成的，直到18世纪初期，才在霍尔的指导下，由一位眼镜师乔治·贝斯制成。第一个消色透镜的专利权大约是在1758年授予了独力进行理论和实验的约翰·多伦德（John Dollond）。

An achromatic lens or achromat is a lens that is designed to limit the effects of chromatic and spherical aberration. Achromatic lenses are corrected to bring two wavelengths (typically red and blue) into focus in the same plane.

The most common type of achromat is the achromatic doublet, which is composed of two individual lenses made from glasses with different amounts of dispersion. Typically, one element is a negative (concave) element made out of flint glass such as F2, which has relatively high dispersion, and the other is a positive (convex) element made of crown glass such as BK7, which has lower dispersion. The lens elements are mounted next to each other, often cemented together, and shaped so that the chromatic aberration of one is counterbalanced by that of the other.