"When" is a song by Canadian singer Shania Twain. It is the second UK release from her 1997 album Come on Over. The song was written by Mutt Lange and Shania Twain. The song was originally released in the summer of 1998. It was the only one of the twelve singles from Come on Over not released to the United States. It was released to Canada however, as a pop single in February 2000. The song was included in the Come on Over Tour and in a medley for the Up! Tour. Shania herself has stated that "When" is her favorite song off Come On Over" in a concert special. "When" is also the theme song for the Japanese drama Cheap Love.

The music video for "When" was shot in New York City, and directed by Markus Blunder. It was released in the UK in August 1998, and played once in the United States on CMT's Video Bio for Twain. The video starts with Twain apparently dying and becoming an angel, and then she goes around New York City, pursuing her love interest. The ending of the video shows her love interest placing a note under her door, which Twain opens to reveal a butterfly drawing and collapsing on her bed, mirroring the opening scene. The last scene shows Twain's angel form re-entering her body, symbolising that she was only daydreaming the whole time. Her stunt double was actress Alissa Dean. Although the video was released only to Europe, two different versions were made, one with the 'Original Album Version', which is more "country", and one with the international version, which is more pop. Both versions of the video have rarely been screened since the single release. "When" is the only video from Twain's first three albums to not be included on the DVD The Platinum Collection, although the rare 'International Version' of the video can be seen on YouTube.

In the UK, "When" became Twain's second top twenty single. It debuted, at its peak, on June 13, 1998 at number 18. It remained on the chart for four weeks.

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