倒夜香（英语：Cleaning Toliet）是倒粪的委婉语，是古老行业，服务业，体力劳动工种，厌恶性工作，运输业。倒夜香现在已经由水厕、化粪车、公厕等取代。

倒夜香出现于旧式唐楼社会，无论在乡村，或者城市住宅地方，有人的地方就有人要大便，无拉水马桶厕所就用痰盂，之后倒进屎塔，上盖密封，等待晚上有屎车来收夜香，清洁工人多数是女工，称为夜香妇，他们用毛巾包鼻，逐家逐户拍门叫「倒夜香」，住户将屎塔（又称为夜香筒）放出户外、楼梯口转角等，夜香妇用担挑搬落街，倒上倒屎车，运走。

在西方社会，未有水厕的社区，都有倒夜香类似的服务，这种虽然是厌恶性职业，但是工人人工不太高。倒夜香有些是地方政府市政局负责，有些是合约私营外判承包。

Night soil is a euphemism for human feces collected at night from cesspools, privies, etc. and sometimes used as a fertilizer. Another definition is "untreated excreta transported without water (e.g. via containers or buckets)". Night soil is produced as a result of a sanitation system in areas without community infrastructure such as a sewage treatment facility, or individual septic disposal. In this system of waste management, the human feces are collected in solid form.