A postal order or postal note is a type of money order usually intended for sending money through the mail. It is purchased at a post office and is payable to the named recipient at another post office. A fee for the service, known as poundage, is paid by the purchaser. In the United States, this is known as a postal money order. Postal orders are not legal tender, but a type of promissory note, similar to a cheque.

In English law, poundage was an ad valorem customs duty imposed on imports and exports at the rate of 1 shilling for every pound of goods imported or exported.