"C'est si bon" is a popular song, sometimes also referred to by the English translation of the title, "It's So Good". The music was written in 1947 by Henri Betti, the French lyrics by André Hornez, and the English lyrics by Jerry Seelen.

The song was popularized by Eartha Kitt in the 1954 film version of New Faces of 1952, and by Johnny Desmond. The Desmond recording was made on May 11, 1949, released by MGM (catalog number 10613), and reached #25 on the Billboard chart. Kitt's recording was made in 1953, released by RCA Victor (catalog number 20-5358, 78rpm and 47-5358, 45rpm), and reached #11 on the Cash Box chart of best-selling records. Louis Armstrong and Yves Montand have performed the song in English and French respectively.

According to the book, Billboard Top Pop Singles by Joel Whitburn, Danny Kaye recorded a version in 1950. Conway Twitty recorded yet another version in 1960. Allan Sherman did a parody of it in 1963 entitled "I See Bones", in which a doctor recounts what he sees in an X-ray. Stan Freberg did a parody of it, in which the male back-up chorus maddens him by constantly singing "si bon, si bon" at the wrong time. Another Parody has been written by Brazilian Rock Star "Rita Lee" called "Cecy bom" with a Salsa rhythm.

The original singer was the Belgian-German singer Angèle Durand. First her French version was a hit in Belgium, and then her German version of the song was a hit in Germany.
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