Monetization (also spelled monetisation) is, broadly speaking, the process of converting something into money. The term has a broad range of uses. In banking, the term refers to the process of converting or establishing something into legal tender. While it usually refers to the coining of currency or the printing of banknotes by central banks, it may also take the form of a promissory currency. The term "monetization" may also be used informally to refer to exchanging possessions for cash or cash equivalents, including selling a security interest, charging fees for something that used to be free, or attempting to make money on goods or services that were previously unprofitable or had been considered to have the potential to earn profits. And data monetization refers to a spectrum of ways information assets can be converted into economic value.

Another meaning of "monetization" denotes the process by which the U.S. Treasury accounts for the face value of outstanding coinage. This procedure can extend even to one-of-a-kind situations such as when the Treasury Department sold an extremely rare 1933 Double Eagle. The coin's nominal value of $20 was added to the final sale price, reflecting the fact that the coin was considered to have been issued into circulation as a result of the transaction. In some industry sectors such as high technology and marketing, monetization is a buzzword for adapting non-revenue-generating assets to generate revenue.