毛瓣无患子（学名：Sapindus rarak）为无患子科无患子属下的一个种。

Sapindus rarak is a species of soapberry. It is a deciduous tree up to 42 metres (138 ft) tall native to south and east Asia (from India and Sri Lanka in the west to south China and Taiwan in the north and to Indonesia in the south). Its species name is derived from the Malaysian name rerak or rerek. In Indonesia it is commonly known as Lerak or Klerek.