"It's Oh So Quiet" is a song by American singer Betty Hutton, released in 1951 as the B-side to the single "Murder, He Says". It is a cover of the German song "Und jetzt ist es still", performed by Horst Winter in 1948, with music written by Austrian composer Hans Lang and German lyrics by Erich Meder. The English lyrics were written by Bert Reisfeld. A French title, Tout est tranquille, was performed in 1949 by Ginette Garcin and the Jacques Hélian Orchestra.

The song was covered by Icelandic musician Björk in 1995. It was released as the third single from her second album Post and remains her biggest hit, reaching number 4 in the UK and spending 15 weeks on the UK Singles Chart. Fuelled by the Spike Jonze-directed music video clip, the single also shot Björk into the spotlight in Australia, where it reached number 6. In the United Kingdom the single has been certified as Gold, having sold upwards of 400,000 copies. Despite being her biggest hit between general public, the song did not manage to get to Björk's 2002 compilation Greatest Hits, the singles for which were voted by fans via online survey.

A version of "It's Oh So Quiet" was used in a Maybelline advertisement, and a version by Amanda Fondell was used in an advertisement for Candy Crush Saga.

The music video, directed by Spike Jonze, which was shot in San Fernando Valley, California, features everything in slow motion and set as a Broadway musical style as Björk sings the verses; during the riotous chorus, everything returns to regular speed and everyone near her dances along. Normal life resumes during the next verse with the return of slow motion. This theme continues throughout the video. This video is based on Jacques Demy's 1964 film Les Parapluies de Cherbourg.

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