湿租（英语：wet lease）指的是航空公司跟其他公司租借飞机，连同机上最少一名机组人员一起租。这种状况最常出现在刚成立的航空公司，或自己的公司没有租借的同型机，还有旅游旺季、麦加朝圣等特殊节日时。例如远东航空租给吴哥航空的波音757，即是采用湿租模式。著名的湿租公司有美国的亚特拉斯航空（Atlas Air），曾湿租多架波音747货机给予中华航空。但代码共享不是湿租。相对于湿租则为干租（dry lease）。

Aircraft leases are leases used by airlines and other aircraft operators. Airlines lease aircraft from other airlines or leasing companies for two main reasons: to operate aircraft without the financial burden of buying them, and to provide temporary increase in capacity. The industry has two main leasing types: wet-leasing, which is normally used for short-term leasing, and dry-leasing which is more normal for longer-term leases. The industry also uses combinations of wet and dry. For example, when the aircraft is wet-leased to establish new services, then as the airline's flight or cabin crews become trained, they can be switched to a dry lease.