The Quarter Pounder is a brand of hamburger introduced in 1971 by a Fremont, California franchisee of international fast food chain McDonald's and extended nationwide in 1973.

Its name refers to the beef patty having a precooked weight of approximately one quarter of a pound, originally portioned as four ounces (113.4 g) but increased to 4.25 oz (120 g) in 2015.

[3] In some countries where the pound is not customarily used as a unit of weight, the hamburger's branding instead features the word Royal.

The Quarter Pounder was created by Al Bernardin, a franchise owner and former McDonald's Vice President of product development, in Fremont, California, in 1971.

[7] On October 1, 2018, McDonald's announced that it would remove all artificial preservatives, flavors, and coloring from the Quarter Pounders.

[8] An E. coli outbreak from September to October 2024 was linked to contaminated slivered onions supplied by Taylor Farms that were used in Quarter Pounders in 14 states.

[18] In English-speaking countries the product retains the Quarter Pounder name despite metrication; in Quebec, it is known as Quart de livre.

The restaurant later jocularly introduced the 3⁄9 Pound Burger anew in 2021 amid Internet folklore relaying the story.