Knott's Berry Farm is a theme park in Buena Park, California, owned by Cedar Fair Entertainment Company. It is also a line of jams, jellies, preserves, and other specialty food, produced by The J. M. Smucker Company based in Placentia, California. Knott's is the most visited park in the Cedar Fair chain with 3.654 million visitors in 2011.

The theme park sits on the site of a former berry farm established by Walter Knott and his family. Beginning around 1920, the Knott family sold berries, berry preserves, and pies from a roadside stand along State Route 39. In 1934, the Knotts began selling fried chicken dinners in a tea room on the property, later called "Mrs. Knott's Chicken Dinner Restaurant". The dinners soon became a major tourist draw, and the Knotts built several shops and other attractions to entertain visitors while waiting for a seat in the restaurant. In 1940, Walter Knott began constructing a replica Ghost Town on the property, the beginning of the present-day theme park. Knott added several other attractions over the years, and began charging admission to the attractions in 1968. In 1983, Knott's Berry Farm added Camp Snoopy, which began the park's present-day association with the Peanuts characters.

In the 1990s, following the deaths of Walter Knott and his wife, Cordelia, their children sold the family business; the theme park was sold to Cedar Fair, while the food business was sold to ConAgra Foods, which subsequently sold to J. M. Smucker. Cedar Fair has continued to expand the theme park, adding Knott's Soak City in 1999 and adding other rides to the original park.