加拿大横贯公路 （英文：Trans-Canada Highway，法文：Route Transcanadienne），又称横加公路，是一条横贯加拿大的公路。主线西起英属哥伦比亚省的维多利亚，东至纽芬兰省的圣约翰斯，全长8,030公里。另一条连接温尼伯和夏洛特皇后群岛马塞的耶洛黑德公路也是本公路的一部分。

《加拿大横贯公路法案》 （Trans-Canada Highway Act）在1948年获议会通过。工程于1950年开始，1962年启用，1971年完工。

由于加拿大国内公路系统的建造和管理都是由各省政府负责（而非联邦政府），横加公路的干线编号亦因省而异。横加公路沿线设有绿底白枫叶的标记以作识别。

The Trans-Canada Highway (French: Route Transcanadienne) is a transcontinental federal-provincial highway system that travels through all ten provinces of Canada between its Pacific Ocean and Atlantic Ocean coasts to the west and east respectively. It is, along with the Trans-Siberian Highway and Australia's Highway 1, one of the world's longest national highways, with the main route spanning 8,030 km (4,990 mi). The system was approved by the Trans-Canada Highway Act of 1949, with construction commencing in 1950. The highway officially opened in 1962, and was completed in 1971. Upon its original completion, the Trans-Canada Highway was the most lengthy uninterrupted highway in the world. The highway system is recognizable by its distinctive white-on-green maple leaf route markers.