"I Believe in You" is a song by Australian singer Kylie Minogue for her ninth greatest hits compilation, Ultimate Kylie (2004). It was written by Minogue alongside its producers Jake Shears and Babydaddy. It was released as the lead single from Ultimate Kylie on 29 November 2004, by Parlophone. "I Believe in You" is a pop and Euro disco song in which Minogue proclaims there are many things in which she does not believe, but that she does believe in her lover.

Kylie Ann Minogue is an Australian singer and actress. She is the highest-selling female recording artist from Australia, having sold over 80 million records worldwide. She has been recognised for reinventing herself in music as well as fashion, and is referred to by the European press as the "Princess of Pop" and a style icon. Her accolades include two Grammy Awards, four Brit Awards and eighteen ARIA Music Awards. In 2024, Time named her one of the most influential people in the world.