Ai no Uta (愛のうた / Song of Love) is the 37th single released by Japanese pop singer-songwriter Kumi Koda. The single was released in CD and CD+DVD, with limited editions carrying the "Urban Kiss Version" of Ai no Uta. The single was released on September 12, 2007 and followed the theme of Yume no Uta/Futari de... as an autumn/winter-time love ballad. It charted at #2 on Oricon and stayed on the charts for twenty-two weeks.

Ai no Uta is Japanese pop singer-songwriter Kumi Koda's thirty-seventh single released under the Avex sub-label Rhythm Zone. It charted at #2 on the Oricon Singles Charts and remained on the charts for twenty-two weeks. It was released in September 2007 and continued the theme of an autumn/winter-time love song, such as she did with Yume no Uta/futari de... the year prior during her Black Cherry era.

The single was released in both CD and CD+DVD editions, with limited editions of each. Limited editions contained one bonus track: a remix of "Ai no Uta."

The title track has been described as a song about the sadness of fleeting love and how fragile and precious it is. The b-side, "Come Over," was the theme song used for the World Judo 2007 (世界柔道2007 / Sekai Judo 2007).

"Ai no Uta" was certified by the RIAJ as being downloaded as a ringtone more than one million times, and as a full-length download to cellphones more than 750,000 times.

In North America, the song received positive to mixed reviews. Many fans had called the song "generic" and "plain." Rinoa agreed and even said that "the title [was] too typical." Others, however, said the song was "stunning" and praised the song for Kumi's vocals and the imagery used in the music video.

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