Bitter may refer to:
- "Bitter", a song by keeno featuring Hatsune Miku.
- "●Bitter & Sweet○", a song by Shikaku Dot featuring Otomachi Una.
- "Bitter Choco Decoration" (ビターチョコデコレーション), a song by syudou featuring Hatsune Miku.
- "Bitter Drop" (ビタードロップ), a song by RyousukeP featuring MEIKO.
- "Bitter-Edge", a song by Raimei-P featuring Kagamine Len.
- "The Bitter End" (なれのはて (Nare no Hate)), a song by Nashimoto Ui featuring Hatsune Miku.
- "Bitter Love" (ビターラブ), a song by UgoP featuring GUMI.
- "Bitter Love Sweet Love" (ビターラブスイートラブ), a song by Candyboy featuring Megurine Luka.
- "Bitter Majesty", a song by Hachiouji-P featuring Hatsune Miku.
- "Bitter Night Underground" (ビターナイト・アンダーグラウンド), a song by Shino featuring Hatsune Miku.
- "Bitter Orange", a song by Takumi featuring GUMI.
- "Bitter Words", a song by Marin Hinawa featuring Hatsune Miku.
See also Bitter Sweet (disambiguation), Bittersweet (disambiguation)