水上出租车，香港称为水上的士，是用于拥有河道的城市的公共交通工具，其特性为定时开出，搭载数字以上的乘客，类似渡轮及巴士。

在美国纽约、巴尔的摩、劳德代尔堡，加拿大温尼伯、英国伦敦、日本东京、印尼雅加达以及中国杭州都有此项交通工具。

在意大利威尼斯有与的士相类的只搭载少量乘客的水上出租车。俄罗斯莫斯科因应交通问题，分别推出各种出租车的服务项目，包含水上出租车。 在韩国首尔，近几年在汉江亦见。

A water taxi or a water bus, also known as a sightseeing boat, is a watercraft used to provide public or private transport, usually, but not always, in an urban environment. Service may be scheduled with multiple stops, operating in a similar manner to a bus, or on demand to many locations, operating in a similar manner to a taxi. A boat service shuttling between two points would normally be described as a ferry rather than a water bus or taxi.