"Stranger" is a song recorded by American singer Hilary Duff for her fourth studio album, Dignity (2007).

It was written by Duff and Kara DioGuardi with the song's producers Vada Nobles, Derrick Harvin, and Julius "Logic" Diaz.

Although he stated he would prefer "Danger", another song on Dignity, to be a single, he said "Stranger" "[wouldn't] sound out of place on a Britney Spears album, which suggests to me that she's done a passable job of leaving behind her bubblegum past", and that it made him "[do] a fair bit of seat-dancing".

They gave the song a positive review, adding that "Stranger" "need[ed] to be a success" and was "cool, confident slice of dance pop and some of Duff's best work to date".

[12] Gary Lancaster of TeenSpot gave the song four stars, calling it an "example of how a modern pop anthem really should sound".

[15] In the United States, "Stranger" reached number ninety-seven on the Billboard Hot 100 and became Duff's lowest peaking song on the chart, on which it spent one week.

[25] In Australia, the song was the third most-added to radio in the week ending October 24;[26] it entered the Australian ARIA Singles Chart on November 12 at number sixty-eight on download sales alone.

[28] The video for the single was directed by Fatima Robinson and was shot in Los Angeles, including at a mansion in Silver Lake, between May 10 and 12, 2007.

The video begins with Duff's character running out of her home to look for her romantic partner (played by Nick Hounslow),[31] who drives away.

Blender magazine wrote, "Her dancing skills are still a tad stilted but she makes up for it with some key 'despondent' and 'perturbed' acting faces", also noting what it described as "shameless close-ups of a certain cell phone".