The 1958–59 United States network television schedule was for the period that began in September 1958 and ran through March 1959.
According to television historians Castleman and Podrazik (1982), the networks' schedules were thrown "into complete chaos" by the quiz show scandals that erupted during fall 1958. At first only one series, Dotto, was implicated in the game-fixing charges. Ed Hilgemeier, a contestant on the program, filed a complaint with the show's sponsor, Colgate-Palmolive. Colgate withdrew its sponsorship of the Tuesday evening (on NBC) and daytime (on CBS) versions of Dotto, and the show did not appear on either network's fall 1958 schedule.
The $64,000 Challenge (on CBS) similarly did not appear that fall, and by November, The $64,000 Question (CBS) and Twenty One (NBC) were also removed from the network schedules, amidst accusations of game rigging. NBC's primetime Tic-Tac-Dough lasted through December. According to Castleman and Podrazik, "NBC and CBS were adamant in their own statements of innocence" since they only aired, and did not produce, the rigged series. They also claimed the cancellations were due to low ratings, not because of game-fixing accusations. ABC had few game shows on its 1958–59 schedule, and "eagerly pointed out" its innocence in the quiz show mess. The network affirmed its commitment to Westerns, which could not be rigged.
Western TV series continued to be very popular with audiences, and for the first time, the three highest-rated programs on television, CBS's Gunsmoke, NBC's Wagon Train, and CBS's Have Gun – Will Travel, were all Westerns. ABC's new series, The Rifleman even hit #4, quite a feat for a network which had had no series in the top 30 five years earlier.