Who is the grouchy diner owner on "Gilmore Girls"?

The grouchy diner owner on Gilmore Girls is Luke Danes. Played by Scott Patterson, Luke runs Luke’s Diner in Stars Hollow, Connecticut, the small-town restaurant where Lorelai and Rory Gilmore regularly drink coffee, eat burgers and trade rapid-fire dialogue. His blunt rules and impatience with town nonsense give him the gruff personality described in the question.

Luke’s connection to the diner is personal. He took over the business after his father’s death; the location had previously been his father’s hardware store. Luke later lives in an apartment above the diner, making the restaurant both his workplace and his home. Despite his complaints and apparent hostility, he repeatedly helps the people around him, especially Lorelai and Rory.

Luke is more than a supporting restaurant owner. His long friendship with Lorelai eventually becomes a central romantic storyline, while his relationship with his nephew Jess adds another major family thread. A common mix-up is confusing Luke with Sookie St. James, who is the chef at the Independence Inn and later the Dragonfly Inn—not the owner of Luke’s Diner.