"I Begin to Wonder" is a song co-written by Dannii Minogue, Jean-Claude Ades, Dacia Bridges and Olaf Kramolowsky for Minogue's 2003 album Neon Nights. The song was released as the album's second single in March 2003. The single reached the top twenty in multiple countries, and topped the club charts in the United Kingdom. In 2003, it was certified gold in Australia. "I Begin to Wonder" received positive reviews from music critics, and is considered by Minogue to be her "signature tune". Its futuristic music video, directed by Phil Griffin, features Minogue dancing in a room with the song's title swirling around her in numerous languages.

"I Begin to Wonder" was originally performed by German dance music producer Jean-Claude Ades. Minogue's record label, London Records, played the song for her and she thought that it "could definitely be a pop hit". She approached Ades and asked him if he would be willing to transform "I Begin to Wonder" from a club song to a pop song. Together they added additional lyrics and rearranged its instrumentation. Minogue considers the track to be her "signature tune" and is one of her favourite songs to perform live.

In a review for Musicomh.com, Alexis Kirke described it a "simple but energetic" song with a "striding electro-bass line and some heavy vocal effects". Cristín Leach of RTÉ Entertainment called "I Begin to Wonder" one of the best songs on Neon Nights.MSN Entertainment called the track a "decent slice of sparkly radio pop with big synths and 'sexy' vocals".

The music video was directed by Phil Griffin and filmed in late 2002. The video opens with a scene of Minogue walking down a futuristic hallway covered in photographs used to promote Neon Nights. She is then shown sitting and dancing in a blue room with the song's title swirling around her in numerous languages. The video concludes with scenes of Minogue crouching in a ventilation shaft and cutting her hair.

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