"Happiness" is the twentieth single by Japanese boy band, Arashi, as well as its title song's name.

The single is the group's ninth consecutive and seventeenth overall number one release, as well as their third consecutive English-titled release.

"Happiness" was used as the theme song for the drama Yamada Tarō Monogatari starring Arashi members Kazunari Ninomiya and Sho Sakurai.

The song's music video was included in their official YouTube channel, when it opened in 2019, and later on, also a live version.

The song was also included in their official pages of streaming sites Apple Music, Spotify, and the such.