"Happiness" (ハピネス) is a song written and recorded by Japanese-American singer-songwriter Ai. Originally released digitally on November 18, 2011 as the second single from Ai's ninth studio album, Independent, it was released physically on December 14, 2011, by EMI Music Japan alongside "Letter in the Sky".

Ai Carina Uemura , known mononymously as Ai, is a Japanese-American singer-songwriter, rapper, record producer, spokeswoman, and actress. Born in Los Angeles, California, Ai moved to Kagoshima, at age 4. Motivated to become a singer, Ai returned to Los Angeles during her adolescence, attending the Los Angeles County High School for the Arts. While in Los Angeles, Ai performed as part of a gospel choir at a Mary J. Blige concert and appeared as a backup dancer in Janet Jackson's music video, "Go Deep". She briefly joined the Asian girl group SX4 in 1999 until she graduated high school.