"Osaka Koi no Uta" (大阪　恋の歌^?, "Osaka Love Song") was the twenty-sixth single of J-pop idol group Morning Musume, from the group's seventh album Rainbow 7. It was released on April 27, 2005 under the Zetima label, and went on to sell a total of 59,287 copies. The single reached a peak of #2 on the weekly Oricon chart, charting for five weeks. The Single V, released on the same day, went on to sell a total of 30,324 copies. The Single V reached a peak of #6 on the weekly Oricon chart, charting for four weeks.

The limited edition of the single came in special packaging, and both the limited and first press of the normal edition came with photocards featuring members of the group (the limited edition containing five cards, while the normal edition only contained one). Buyers of the single or Single V were given the opportunity to send in a form to be eligible for a chance to receive a special 8 cm CD (limited to 10,000 copies) containing Ishikawa's comments on her graduation.

The titular song is sung in Osaka-ben. Producer Tsunku wrote all lyrics on the single and composed both songs, with arrangement by Hideyuki "Daichi" Suzuki and Yuichi Takahashi. The song's lyrics are meant to sound and mean different things in different languages. As producer, Tsunku asked the girls to study about Osaka in preparation for the single. The coupling song, "Nature is Good!", was used as the theme and image song for the Asahi Broadcasting Corporation's programme "Gurasu no Chikyū o Sukue" (ガラスの地球を救え, Save the Glass Planet^?) between April and June 2005.

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