Which fast food chain serves square hamburger patties?

The fast food chain known for serving square hamburger patties is Wendy’s.

Wendy’s founder Dave Thomas introduced the chain’s square patties when he opened the first restaurant in Columbus, Ohio, in 1969. The shape was inspired partly by Kewpee Hamburgers, the Kalamazoo, Michigan, chain Thomas knew from his hometown. Wendy’s patties extend beyond the edges of their circular buns, creating the impression of a generous portion.

The square shape also became a central part of Wendy’s branding. The company’s slogan “Quality Is Our Recipe” emphasized its food, while later campaigns leaned into the visual contrast between square beef and round buns. Wendy’s is closely associated with this design even though individual menu items and patty shapes have changed slightly over time.

The other choices use different signature cues: Burger King is associated with flame-grilled burgers, McDonald’s with the Big Mac and golden arches, and In-N-Out with its West Coast menu. Wendy’s square patties are therefore the canonical answer to this question.