"True Blue" is a song by American singer Madonna. It is the title track from her third studio album True Blue (1986), and was released as the album's third single on September 17, 1986 by Sire Records. Written and produced by Madonna and Steve Bray, the song deals with the feelings of Madonna for her then-husband Sean Penn. A dance-pop song, it features instrumentation from a rhythm guitar, a synthesizer, keyboards, and drums. The main chorus is backed by an alternate one, incorporating a chord progression generally found in doo-wop music.

Received by the critics as a light-hearted and cute retro song, "True Blue" topped the charts in UK, Ireland and Canada and became another consecutive top ten song in US for Madonna by reaching number three on the Billboard Hot 100. The original music video portrayed her again with a new look, leaner and sporting platinum blond bushy hair. An alternate video was made through the "Make My Video" contest on MTV. The final selected videos had a similar theme of a 1950s-inspired setting and the storyline following the lyrics of the song. "True Blue" has been performed on the Who's That Girl World Tour (1987) and the Rebel Heart Tour (2015–16).

Madonna wrote and produced the song with Steve Bray. According to her, "True Blue" takes its title from a favourite expression of her then husband Sean Penn and to his very pure vision of love and was a direct tribute to him as well as the album, which was as a whole inspired by her "unabashed valentine" for Penn. In an interview, Bray said, "She [Madonna] was very much in love. It was obvious if she's in love she'll write love songs. If she's not in love she definitely won't be writing love songs." In 2015, Madonna said that "True Blue" is "a song about true love. I didn't know what I was talking about when I wrote it."

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