Dr Pepper is a carbonated soft drink created in the 1880s by American pharmacist Charles Alderton in Waco, Texas. It was first marketed nationally in the United States in 1904. The beverage is manufactured and distributed by different companies depending on the country: Keurig Dr Pepper produces it in the United States, Canada, and Mexico; The Coca-Cola Company in the United Kingdom, Ireland, Japan, and South Korea; and PepsiCo in several other markets. Variants include a diet version and, beginning in the 2000s, a range of additional flavors.

Although it shares some similarities with cola, the U.S. Food and Drug Administration has determined that Dr Pepper is not classified as a cola, root beer, or fruit-flavored soft drink. Instead, it is generally described as belonging to a distinct category often referred to as "pepper soda", named after the brand itself. Other beverages in this category, such as Dublin Original and Mr. Pibb, have a comparable flavor profile.

As of 2024, Dr Pepper is the second best-selling carbonated soft drink in the US.