"Heavy on My Heart" is a song by American recording artist Anastacia from her third studio album, Anastacia. Written by Anastacia and Billy Mann, its arrangement is built on simple guitar riffs, and its lyrics chronicle Anastacia's battle with breast cancer. The song was released as the album's fourth and final single on March 7, 2005, and entered the top twenty in Hungary, Italy, the Netherlands, and Spain. A French version of the song, titled "Trop Lourd dans Mon Coeur" (meaning "Too Heavy on My Heart"), appears as a B-side to the single.

The song was well received by music critics who complimented the singer vocals. Allmusic editor Matthew Chisling described this song: "a shimmering ballad flushed by pain, love, and bombastic sounds that collide like tidal waves in what can only be described as a magical four minutes." Yahoo! Music editor Dann Genoe wrote: "Power ballad "Heavy On My Heart" is prime for a soft focus video."

The video was directed by Ronald Vietz and filmed in Bucharest, Romania, between November 26–29, 2004. It was inspired by Hans Christian Andersen's fairy tale "The Steadfast Tin Soldier".

In the video, Anastacia is shown as a mannequin, which falls in love with another mannequin. At the chorus she breaks the window and runs to the male mannequin. They dance in the snow and fall in love. The two then run into a room and make out. Later, the shop in which they are displayed goes out of business. All of the shop's materials are thrown away and sent to some sort of factory where a fire burns. They end up being melted in a fire and while holding hands, their shapes are contorted into the image of a heart. The video also shows Anastacia singing in a dark green room. She is dressed in all black which conceals all of her but her head and hands.

It appears as if she is mourning the loss of the lovers and the many empty chairs around her, that she later thrashes about the room, symbolizing that she is alone, which is the song's theme.

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