环法自行车赛（法语：Le Tour de France）是知名的年度多阶段公路单车运动赛事，主要在法国举办，但也经常出入周边国家(如英国、比利时，还有比邻的西班牙比利牛斯山中)。自从1903年开始以来，每年于夏季举行，每次赛期23天，平均赛程超过3500公里(约2200英里)。完整赛程每年不一，但大都环绕法国一周。近年来，比赛结束前总是会穿越巴黎市中心的香榭丽舍大道，并且经过艾菲尔铁塔。比赛全程分成许多段，从一个城镇到下一个，每一段分别计时排名。所有段成绩累计起来决定每一位赛手的总成绩。冠军为各段时间累计最少者。在每日赛事结束时，领先者将可穿上黄色领骑衫，最佳冲刺者将被赠与一件绿色车衣，山间赛事中之最佳骑士将会得到一件波尔卡点运动衣，其有时被称作山颠之王(King of the Mountains)。

The Tour de France (French pronunciation: ​[tuʁ də fʁɑ̃s]) is an annual multiple stage bicycle race primarily held in France, while also occasionally making passes through nearby countries. The race was first organized in 1903 to increase paper sales for the magazine L'Auto; it is currently run by the Amaury Sport Organisation. The race has been held annually since its first edition in 1903 except when it was stopped for the two World Wars. As the Tour gained prominence and popularity the race was lengthened and its reach began to extend around the globe. Participation expanded from a primarily French field, as riders from all over the world began to participate in the race each year. The Tour is a UCI World Tour event, which means that the teams that compete in the race are mostly UCI WorldTeams, with the exception of the teams that the organizers invite.