"The Song from Moulin Rouge" (also known as "Where Is Your Heart") is a popular song that first appeared in the 1952 film Moulin Rouge.

The music was written by Georges Auric. The original French lyrics were by Jacques Larue, the English words by William Engvick. However, in the film the song is called "It's April Again", and there is no mention of the phrase "Where Is Your Heart". A similar instance occurred in Romeo and Juliet, in which the love theme was entitled "What Is a Youth?" in the film, but became "A Time For Us" when recorded as a popular song.

In Moulin Rouge, the theme song was sung by Muriel Smith, dubbing for Zsa Zsa Gabor who lip-synched to Smith's singing.

The most popular version of the song was made by Percy Faith's Orchestra, with a vocal by Felicia Sanders. The recording by Faith and Sanders was made on January 22, 1953 and released by Columbia Records as catalog number 39944. It first reached the Billboard charts on March 28, 1953 and lasted 24 weeks on the chart, peaking at #1.

In the United Kingdom, the version by Mantovani was the biggest hit. This version also charted in the U.S. The recording by Mantovani was released in the U.S. by London Records as catalog number 1328. It first reached the Billboard chart on May 16, 1953 and lasted 5 weeks on the chart, peaking at #13. However, in the United Kingdom Mantovani's version of the track reached number one in the UK Singles Chart.

The song also reached #1 on the Cash Box chart, which combined all versions, in 1953. Both Faith's and Mantovani's versions sold over a million copies.