梁桥是一种高度刚性，横跨在两端支架上的水平结构，在结构上如同一根横梁用以支持交通运输。它是直接传承自独木桥，现在一般使用Ｉ型钢、箱梁、强化水泥或预拌混凝土建造于浅滩上。它是一种常用的行人天桥及公路交流道和高架桥。如同它的早期样式，这种桥在结构上是众多桥梁种类中最简单的一种。

Beam bridges are the simplest structural forms for bridge spans supported by an abutment or pier at each end. No moments are transferred throughout the support, hence their structural type is known as simply supported.

The simplest beam bridge could be a log (see log bridge), a wood plank, or a stone slab (see clapper bridge) laid across a stream. Bridges designed for modern infrastructure will usually be constructed of steel or reinforced concrete, or a combination of both. The concrete elements may be reinforced, prestressed or post-tensioned.