Epos or EPOS may refer to:

• Electronic point of sale, technology which enables an efficient recording of the sale of goods or services to the customer
• An epic poem, see epic poetry
• Epos (library ship), a floating library in Norway
• Epos Ltd, a British loudspeaker manufacturer
• Montre Epos SA, a Swiss watch manufacturer
• Embedded PowerPC Operating System, an IBM product
• Mikoyan-Gurevich MiG-105, also known as EPOS, a proposed Russian spaceplane
• "Epos", a song by Zedd on Clarity
• Elaine Paige on Sunday, a show on BBC Radio 2
• Emergency Physician Online Support, a group of physicians providing emergency medical services support

The point of sale (POS) is the time and place where a retail transaction is completed. It is the point at which a customer makes a payment to the merchant in exchange for goods or after provision of a service. At the point of sale, the merchant would prepare an invoice for the customer (which may be a cash register printout) or otherwise calculate the amount owed by the customer and provide options for the customer to make payment. After receiving payment, the merchant will also normally issue a receipt for the transaction. Usually the receipt is printed, but it is increasingly being dispensed electronically.