罗曼式建筑（英语：Romanesque architecture，又译罗马式建筑、罗马风建筑、似罗马建筑）为欧洲中世纪一种以半圆拱为特征的建筑风格，并从12世纪开始逐渐过渡到以尖拱为特征的哥特式建筑。虽然对于这一风格的起源时间有从6世纪到10世纪等不同的提议，尚未达成共识，但其建筑实例遍及欧洲大陆，使其成为自古罗马建筑之后第一种风靡欧洲的建筑形式。在英格兰，这一风格在传统意义上更倾向于指诺曼式建筑。

罗曼式建筑兼有西罗马和拜占庭建筑的特色，并因其结实的质量、厚重的墙体、半圆形的拱券、坚固的墩柱、拱形的穹顶、巨大的塔楼以及富于装饰的连拱饰而知名，显得雄浑而庄重。每座建筑有明确、清晰的形式，并且常常采用规则对称的平面，所以在与随后的哥特式建筑比较时，总体上会有一种质朴的形象。尽管有地域特征和材料差异，这一形式仍可以在欧洲各处被识别。

Romanesque architecture is an architectural style of medieval Europe characterized by semi-circular arches. There is no consensus for the beginning date of the Romanesque style, with proposals ranging from the 6th to the late 10th century, this later date being the most commonly held. It developed in the 12th century into the Gothic style, marked by pointed arches. Examples of Romanesque architecture can be found across the continent, making it the first pan-European architectural style since Imperial Roman Architecture. The Romanesque style in England is traditionally referred to as Norman architecture.