"In the Shape of a Heart" is a song written and performed by American singer-songwriter Jackson Browne included on his 1986 album, Lives in the Balance. Released as the second single from the album, it reached #70 on Billboard's Hot 100 chart, spending seven weeks on that chart after debuting at #72, but was a big Adult Contemporary hit, peaking at #10. It was also released as a single in the United Kingdom and Japan, and as a promotional 12" in Germany. A heart-shaped red vinyl promotional single was also released by Asylum, which included two remixes.

Browne is documented as saying that the song specifically addresses his relationship with his first wife, Phyllis Major, who died in March 1976 of a drug overdose:

Jimmy Guterman, upon reviewing the album in 1986, singled out the song as a "mature version of the dark love songs on The Pretender. With the lyric "I guess I never knew/What she was talking about" coupled with "I guess I never knew/What she was living without,'" Guterman writes, Browne "nails heartbreak to the wall and sends his listeners scurrying for the Kleenex." In 1989, the magazine referred to it as "one of Browne's finest love songs."

In lines such as "People speak of love / Don't know what they're thinking of / Wait around for the one who fits just like a glove," the song can be read as the expression of a more experienced, skeptical or realistic view of love relationships. They "try to fit some name to their longing." Browne speaks of damage:

The lyrics concludes with a dramatic moment:

Addressing the song's relationship between music and message, Allmusic's Mike DeGagne wrote that Browne "maintains a certain empathetic sincereness that is created without utilizing the traditional ballad-like form, and the song is helped along musically by a sound rhythm and a positive tempo, taking away any indications of self-pity."

The B-side of the single was a non-album track; a recording of Little Steven's "Voice Of America," from Steve Van Zandt's 1984 album of the same name. That recording has never been made available on album or CD, although Browne put his version of Van Zandt's "I Am A Patriot" on his next album, World in Motion.

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