合乘出租车，或称合乘的士、合乘出租车，在香港又俗称泥鯭的、，中国大陆又称为拼出租车、拼车、拼的士，台湾则称作共乘出租车或叫客出租车指出租车司机在不遵守计程器（又称为咪表）收费的情况下接载多名各不相识的乘客前往相若目的地以另收一个指定服务价钱，是合乘的一种。乘客一般只需付比平常少的费用，司机则可收取多人的付费而得到比平时较多的收入。世界各地如中国大陆、台湾部份地区、香港亦有相似的情况。

这些现象一般出现在市区地方，兼有热闹夜生活的地方，看准夜间公共交通的不足以形成，同时也需要有一批对前往相近目的地有需求的乘客。但是，不少城市在深夜仍可提供可合法议价的出租车服务，因而杜绝了此问题。

A share taxi is a mode of transport which falls between both taxicabs and buses. These vehicles for hire are typically smaller than buses and usually take passengers on a fixed or semi-fixed route without timetables, but instead departing when all seats are filled. They may stop anywhere to pick up or drop off passengers. Often found in developing countries, the vehicles used as share taxis range from four-seat cars to minibuses. They are often owner-operated.