"Stand by Your Side" is a song recorded by Canadian recording artist Celine Dion, for her eight English studio album One Heart (2003). It was written by Paul Barry, Mark Taylor, and produced by Taylor and Humberto Gatica. The moving ballad sees Dion promising to someone who has been deeply wounded that she will comfort and support it. It was released on 29 September 2003 as the third (promotional only) single from the album, in the United States. "Stand by Your Side" reached number 17 on the US Hot Adult Contemporary Tracks.

On 16 September 2003, Dion's official website announced that the ballad was selected as the next single for adult contemporary radio in North America. "Stand by Your Side" was written by Mark Taylor and Paul Barry, who also wrote Cher' smash hit, "Believe" while production was handled by Taylor and Humberto Gatica. It is a pop ballad, where Dion promises someone who has been deeply wounded that she will comfort and support them.

Elisabeth Vincetelli of Entertainment Weekly called it an "inevitable power ballad." Chuck Arnold from People commented, "Even her trademark ballads feature less of the vocal histrionics that we've come to expect from Dion." A review from Billboard wrote that "It is a beauty, elegantly restrained and as singable and well-executed as her many previous hits," but ultimately felt that "close followers of Dion's career can't help but feel disappointed that her label doesn't make a meaningful push to be more adventurous. The double-platinum "One Heart" is ripe with the potential to surprise and delight, whether through the uptempo pop perfection of 'Faith' and 'Reveal' or – if a ballad is considered a must – why not the breathtaking 'I Know What Love Is,' a Celine classic in waiting."

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