Morning Musume 20th (モーニング娘。20th) is a collaborative Morning Musume unit formed in November 2017 by the original five members and the fourteen members of Morning Musume '17 in honor of Morning Musume's 20th anniversary.
- 1st Gen: Nakazawa Yuko, Ishiguro Aya, Iida Kaori, Abe Natsumi, Fukuda Asuka
- 9th Gen: Fukumura Mizuki, Ikuta Erina
- 10th Gen: Iikubo Haruna, Ishida Ayumi, Sato Masaki, Kudo Haruka (2017 only)
- 11th Gen: Oda Sakura
- 12th Gen: Ogata Haruna, Nonaka Miki, Makino Maria, Haga Akane
- 13th Gen: Kaga Kaede, Yokoyama Reina
- 14th Gen: Morito Chisaki
- [2018.02.07] Hatachi no Morning Musume
- [2018.12.12] Petit Best 19 (#2 Morning Coffee (20th Anniversary Ver.))
- This is Fukuda Asuka's first Morning Musume-related activity in 18 years since her graduation from the group in 1999.
- This is the first in-group unit to feature all the 1st and 14th generation members.
- "モーニング娘。オリジナル＆現役メンバーのコラボシングル「愛の種(20th Anniversary Ver.)」配信限定でリリース！" (in Japanese). Hello! Project. 2017-11-01.
- "モー娘。’１７と１期生が合体 ２０年前のインディーズデビュー曲リメイク" (in Japanese). Sponichi Annex. 2017-11-01.