大道（法语：Boulevard）是一种带有行道树和侧路，宽度较宽的大街，一般大道为单向至少要有两个车道，双向至少要有四个车道，并有行人和单车专用道。大道最早起源于法国，其最著名的例子就是19世纪巴黎的香榭丽舍大道。20世纪之后，这种道路方式也开始在其他国家出现，特别是在欧陆曾经拥有城墙的城市，许多城墙都被拆除改建环形大道。

A boulevard (French, from Dutch:Bolwerk – bulwark, meaning bastion), often abbreviated Blvd, is a type of large road, usually running through a city. These roads often replaced obsolete fortifications, hence the name.

In modern American usage it often means a wide, multi-lane arterial thoroughfare, divided with a median down the centre, and perhaps with roadways along each side designed as slow travel and parking lanes and for bicycle and pedestrian usage, often with an above-average quality of landscaping and scenery.