Which McDonald’s menu item gave the brand its first national fish sandwich?

The Filet-O-Fish gave McDonald’s its first national fish sandwich.

Franchisee Lou Groen developed the sandwich in Cincinnati, Ohio, where many customers observed the Catholic practice of avoiding meat on Fridays. Sales traditionally fell on those days, so Groen proposed a fish-based menu item that could attract customers without changing McDonald’s basic service model.

The sandwich was tested in 1962 and became a national menu item in 1963. Its original form used a breaded fish fillet, cheese, and tartar sauce on a bun. The product broadened McDonald’s appeal and showed how local franchisee ideas could influence the national brand.

The Filet-O-Fish is sometimes described as a seasonal product, but it became a permanent menu item. Its exact fish sourcing and cheese presentation have changed in different periods and markets.