KFYR (550 kHz) is a commercial AM radio station in Bismarck, North Dakota. It airs a news-talk radio format and is owned by iHeartMedia, Inc. Some hours on weekends, the station plays oldies. The studios are on East Rosser Avenue in Bismarck.

KFYR is powered at 5,000 watts with a signal that can be heard in four U.S. states and two Canadian provinces. By day, it is non-directional. But at night, the station uses a directional antenna with a two-tower array. The transmitter is off 158th Street NE in Menoken. Programming is also heard on 250-watt FM translator K259AF at 99.7 MHz in Bismarck.

KFYR boasts an enormous daytime coverage area. This is due to its location near the bottom of the AM dial; lower frequencies have longer waves that tend to travel farther across terrain. This is especially true for stations that operate at 5,000 watts or more. Additionally, North Dakota's flat landscape provides near-perfect ground conductivity. Combined with its transmitter height, this gives KFYR a daytime footprint equivalent to that of a full-power FM station. It can be heard across almost all of North Dakota during the day, as well as in parts of Minnesota, South Dakota, Montana, Manitoba and Saskatchewan. Under the right conditions, it reaches into Nebraska. It has been claimed that KFYR has the largest daytime coverage area of any AM radio station in the United States. A similar claim can be made for WNAX in Yankton, South Dakota, which transmits on 570 AM.

At night, two towers are used in a directional pattern to protect CBK, the CBC Radio One outlet for most of Saskatchewan, which operates on nearby 540 AM. Even with this restriction, KFYR still covers almost all of North Dakota at night. It is the primary entry point station for the Emergency Alert System in both North and South Dakota.

KFYR signed on the air in 1925; 100 years ago (1925). It was founded by Phillip J. Meyer and his wife, Etta Hoskins Meyer. It is Bismarck's oldest radio station. KFYR began operations with programming for only a few hours daily, signing off between shows. In its early years, it was an affiliate of the NBC Red Network, airing its dramas, comedies, news and sports during the "Golden Age of Radio."

Early programming included live studio musicians, transcribed music and programs, and live feeds from the NBC. Many popular soap operas, game shows, sporting events, religious services, children's programs, and big band broadcasts were part of the regular schedule. The station carried NBC's Monitor on weekends. Other programming included local news, weather, and sports, locally originated variety programs such as "What's The Weather" weekday mornings and "The Northwest Farmfront" weekdays at noon. Mike Dosch, an established musician from Strasburg, North Dakota (Lawrence Welk's hometown) was featured on several of the live shows and had his own late-night program of organ music for many years. There were also shows hosted by staff announcers who played recorded popular music by such artists as Nat King Cole, Doris Day, The Ames Brothers, Fred Waring and the Pennsylvanians, and orchestras including Mantovani, Percy Faith, and Frank Chacksfield.

By 1950, the station had expanded its schedule to an 18-hour broadcast day. It began broadcasting at 6 a.m. and concluded at midnight.

In December 1953, it added television station KFYR-TV 5. Because KFYR was part of the NBC Radio Network, KFYR-TV became western North Dakota's NBC television affiliate, along with its three semi-satellites. In 1966, an FM station went on the air, KFYR-FM at 92.9 (now KYYY).