"I Believe in You" is a song by Australian singer Kylie Minogue. It was written by Minogue and Scissor Sisters members Jake Shears and Babydaddy and produced by Shears and Babydaddy. It received an overall positive reception from music critics when it was released as the first single from Minogue's second greatest hits compilation, Ultimate Kylie, in December 2004. In the song, Minogue describes how she believes in her lover rather than anything else.

The single peaked at number two in the United Kingdom and at number six in Australia. The song became a dance club hit in the United States, peaking at number three on the Billboard Hot Dance Club Play chart in 2005 and earning a nomination for a 2006 Grammy Award in the "Best Dance Recording" category.

"I Believe in You" is a pop and Euro disco song, which features the use of synthesizers and keyboards. The lyrics of the song, co-written by Minogue, describe how she does not believe in anything except her lover, although the song details of a spirit the speaker believes in hence the lyrics "I don't believe that when you die your presence isn't felt." Written and recorded for Ultimate Kylie during the summer of 2004 in London, the song takes its inspiration from disco and 80s new wave electropop music (and has been described as similar to 80s-era New Order).

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