Twin Peaks, Washington is a fictional town that serves as the primary setting of the television series Twin Peaks, created by Mark Frost and David Lynch, and the associated films Twin Peaks: Fire Walk with Me (1992) and Twin Peaks: The Missing Pieces (shot 1991, released 2014). Although the series states that the town is "five miles south of the Canadian border, and twelve miles west of the [Washington-Idaho] state line" (i.e., within the Salmo-Priest Wilderness, where the small town Metaline Falls resides), most of the show's stock exterior footage was shot in the neighboring Washington towns of Snoqualmie, North Bend, and Fall City, around 25–30 miles from Seattle. According to the iconic sign, the town has a population of 51201, which was originally supposed to be 5120, but was changed to the higher number to make it seem larger.

Lynch and Frost started their location search in Snoqualmie on the recommendation of a friend of Frost. In the area, they found all of the locations that they had written into the pilot episode. Common locations within the series originally filmed in the Snoqualmie area include the characters' various homes, the Sheriff's Department, the Double R Diner, The Great Northern Hotel, Big Ed's Gas Farm, and Twin Peaks High School. In addition, two supernatural locations are accessible through portals in the forests surrounding Twin Peaks: The Black Lodge and The White Lodge.

Although the pilot, Fire Walk with Me, The Missing Pieces, and many scenes in season 3 of the television series (2017) were shot on location in Washington state, for convenience, much of the filming for seasons 1 and 2 took place in the Los Angeles area. Many exterior scenes were filmed in wooded areas of Malibu, California, and most of the interior scenes were shot on standing sets in a San Fernando Valley warehouse.

In the series, the Double R Diner is owned and managed by Norma Jennings (Peggy Lipton). Norma employs two waitresses: Shelly Johnson (Mädchen Amick) and Heidi (Andrea Hays).

In the pilot, the Mar-T Cafe (North Bend, Washington) stood in for the Double R Diner. The producers then built a Hollywood soundstage set modeled on the Mar-T Cafe for the remaining interior scenes in seasons one and two.

After the series was cancelled, the cafe was sold to Kyle Twede (/twiːdi/ TWEE-dee), who renamed it Twede's Cafe. In 2000, arsonists set a fire that gutted the cafe; contemporary reports said that the arsonists were burglars trying to cover up their theft of $450. In an interview from May 2015, Kyle Twede described the arsonists as kids who had broken into the cafe to mess around and drink wine coolers and, fearing they would get in trouble, chose to set the place on fire. The interior was destroyed, while the exterior neon sign and the structure remained.

Twede's Cafe reopened in 2001 with a new interior that discarded many features of the original Double R Diner. However, in advance of season three (which was filmed on location), the producers paid to restore the cafe to its original appearance.

In seasons one and two, lead character Dale Cooper flies in from Philadelphia and rents a room in The Great Northern Hotel. The hotel is owned by Ben Horne, a businessman who also owns the local department store and maintains his offices at the Great Northern. In the first two seasons, much of Ben's time is devoted to building Ghostwood, a new country club and residential estate that is intended to replace the Packard Sawmill. Ben's attorney Leland Palmer assists him with the Ghostwood project; the death of Leland's daughter Laura Palmer is the catalyst for the series.