"Tsubomi" (蕾 (つぼみ), "Flower Bud") is a song by Japanese folk rock band Kobukuro. It is their 15th single and is included on its ninth studio album 5296. The song was written and composed by Kentarō Kobuchi. The single was released on March 21, 2007, in two editions: a CD-only edition and a limited edition. It debuted at number two on the weekly Oricon Singles Chart before topping the chart the following week, and it was certified double platinum by the Recording Industry Association of Japan (RIAJ), denoting shipment of 500,000 units. "Tsubomi" earned the Grand Prix award at the 49th Japan Record Awards.

"Tsubomi" was released on March 21, 2007, in two editions: a CD-only edition; and a limited edition which includes a DVD with the short film February 2007 Rehearsal & Live.Marty Friedman pointed out that the song's arrangement was very simple and did away with the influence of the music of the Western culture.

"Tsubomi" was used as the theme song for the television drama Tokyo Tower: Okan to Boku to, Tokidoki, Oton (2007). It was also used as the entrance song for the 80th National High School Baseball Championship the following year.

"Tsubomi" debuted at number two on the weekly Oricon Singles Chart, selling 182,737 copies in its first week. The single sold 69,737 copies and rose to number one the following week, and was certified platinum by the RIAJ shipment of 250,000 units. For the month of April, "Tsubomi" topped the monthly RIAJ Reco-kyō Chart for ringtones. The single was certified double platinum in June. "Tsubomi" became the third best-selling single on the 2007 Oricon yearly singles chart, selling 441,799 copies in Japan. The single charted for 71 weeks and went on to sell 506,093 copies by the end of its chart run.

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