"Didn't You Know How Much I Loved You" is a song written by Chris Lindsey, Aimee Mayo, and Troy Verges, and recorded by American country artist Kellie Pickler. It was released in August 2009 as the third single from her self-titled second album, and her sixth single release overall. The song is a ballad where a narrator describes her lost love, responding to him with said song title as a question.

The song garnered mixed reviews from critics who found the lyrics generic but praised the hook and Pickler's vocal performance of the lyrics. "Didn't You Know How Much I Loved You" peaked at number 14 on the Billboard Hot Country Songs chart and number 97 on the Hot 100. The accompanying music video for the song, directed by Roman White, was shot in the Dominican Republic.

"Didn't You Know How Much I Loved You" is a power ballad, backed primarily by piano and electric guitar. The female narrator describes the feeling of losing the one she loves, responding to him with the question: 'Didn't you know how much I loved you?'

The song was originally featured as a track on Pickler's debut album, Small Town Girl. It was later re-recorded and included on her self-titled second album, from which it was released as a single at Pickler's request: "I love 'Didn’t You Know How Much I Loved You!' I was gonna put it on every album until it was released as a single. I guess they figure this might finally shut me up."

Jim Malec of The 9513 gave the song a thumbs-up rating. Although he described the verses as "disposable and generic", he thought that the song's hook compensated. "“Didn’t you know how much I loved you?” is a great hook. Great enough that we’re not going to remember how average the rest of the song is, only the tremendous power of those words." He also complimented her vocals: "Pickler hits the song’s melodic peak she’s soaring, squeezing out every bit of power and emotion her voice can muster." Roughstock reviewer Bobby Peacock also described the verses as "pedestrian" but added, "[w]ith a good enough vocal performance, even a trite lyric can be elevated greatly." His review also desecribes the title hook favorably. Kevin J. Coyne of Country Universe gave the song a C rating. "There’s such an incongruity between the softly sung verses and the bombastic chorus that it’s hard to get a handle on how she’s asking the titular question. Is she angry? Sad? Disappointed? Disbelieving? Take any twenty seconds of the song, and you might get a different answer."

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