Variety show, also known as variety arts or variety entertainment, is entertainment made up of a variety of acts including musical performances, sketch comedy, magic, acrobatics, juggling, and ventriloquism. It is normally introduced by a compère (master of ceremonies) or host. The variety format made its way from the Victorian era stage in Britain and America to radio and then television. Variety shows were a staple of English language television from the late 1940s into the 1980s.

While the format is still widespread in some parts of the world, such as in the United Kingdom with the Royal Variety Performance, the Philippines with Eat Bulaga! and It's Showtime, and South Korea with Running Man, the proliferation of multichannel television and evolving viewer tastes have affected the popularity of variety shows in the United States. Despite this, their influence has still had a major effect on late night television whose late-night talk shows and NBC's variety series Saturday Night Live (which originally premiered in 1975) have remained popular fixtures of American television.

The live entertainment style known as music hall in the United Kingdom and vaudeville in the United States can be considered a direct predecessor of the "variety show" format. Variety in the UK evolved in theatres and music halls, and later in working men's clubs. British performers who honed their skills in music hall sketches include Charlie Chaplin, Stan Laurel, George Formby, Gracie Fields, Dan Leno, Gertrude Lawrence, and Marie Lloyd. Most of the early top performers on British television and radio did an apprenticeship either in stage variety, or during World War II in Entertainments National Service Association (ENSA). In the UK, the ultimate accolade for a variety artist for decades was to be asked to do the annual Royal Command Performance at the London Palladium theatre, in front of the monarch. Later known as the Royal Variety Performance (from 1919), it continues today. In the 1940s, Stan Laurel revisited his music hall days when he performed at the Royal Variety show.

In the United States former vaudeville performers such as the Marx Brothers, George Burns and Gracie Allen, W. C. Fields, and Jack Benny honed their skills in the Borscht Belt before moving to talkies, to radio shows, and then to television shows, including variety shows. Radio variety shows were the predominant form of light entertainment during the Golden Age of Radio from the late 1920s through the 1940s; such radio shows typically included a house vocalist, music from the house band, a stand-up monologue and a short comedy sketch. Variety shows centered on running comedy sketches with recurring characters eventually evolved into sitcoms (situation comedies).

Variety shows were among the first programs to be featured on television during the experimental mechanical television era. Variety shows hosted by Helen Haynes and Harriet Lee are recorded in contemporary newspapers in 1931 and 1932; because of technical limits of the era, no recordings of either show have been preserved. After World War II, the genre again was an early favorite of the burgeoning electronic television industry; Hour Glass, dating to 1946, is the earliest surviving variety show, preserved in the form of audio recordings and still photographs. The genre proliferated during the Golden Age of Television, generally considered to be roughly 1948 to 1960. Many of these Golden Age variety shows were spin-offs or adaptations of previous radio variety shows.

From 1948 to 1971 The Ed Sullivan Show was one of CBS's most popular television series. Using his no-nonsense approach, host Ed Sullivan was instrumental in bringing many acts to prominence in the United States, including Elvis Presley and The Beatles. One year after Sullivan's premiere, Music & the Spoken Word first aired on television. Having carried over from an already 20-year run on radio, the series airs a program of religious music, messages, and occasional interviews, and remains the longest-running variety show in U.S. television history. "The Arthur Murray Party" (1950–1960) was wildly popular and one of only 5 shows in the history of television to appear on all four major networks at the same time. The premise was a large dance party hosted by Kathryn Murray and Arthur Murray that showcased a new dance and a celebrity guest along with dozens of professional dancers. The show also hosted the only television appearance of Buddy Holly and The Crickets. The Lawrence Welk Show (1955–1982) would go on to become one of U.S. television's longest-running variety shows; based on the concept of the big band remote from the old-time radio era, it was already one of the last shows of its kind when it debuted and far outlasted all other big-band centered broadcast series by the end of its run.

Other long-running American variety shows that premiered during this time include Texaco Star Theatre (1948–1956), Jerry Lester's Cavalcade of Stars, Broadway Open House and Chesterfield Sound-Off Time (1949–1952); The Jackie Gleason Show (1950–1955), The Garry Moore Show (1950–1967, in various incarnations), The Morey Amsterdam Show (1950–1954 in various incarnations), The Colgate Comedy Hour (1950–1955), Your Show of Shows (1950–1954), The Red Skelton Show (1951–1971), The Dinah Shore Show (1951–1957), The George Gobel Show (1954–1960) and The Dinah Shore Chevy Show (1956–1963). Perry Como also hosted a series of variety shows that collectively ran from 1948 to 1969, followed by variety specials that ran until 1994.

Shorter-lived variety shows during this period include The Frank Sinatra Show (1950–1952), The Jimmy Durante Show (1954–1956) and a different The Frank Sinatra Show (1957–1958).