Diana Ross (born March 26, 1944) is an American singer and actress. She was the lead singer of the vocal group the Supremes, who became Motown's most successful act during the 1960s and one of the world's best-selling girl groups of all time. They remain the best-charting female group in history, with a total of 12 number-one pop singles on the U.S. Billboard Hot 100, including "Where Did Our Love Go", "Baby Love", "Come See About Me", "Stop! In the Name of Love", "You Keep Me Hangin' On", and "Love Child".

Following her departure from the Supremes in 1970, Ross embarked on a successful solo music career with the release of her eponymous debut solo album and its singles, "Ain't No Mountain High Enough" – her first solo U.S. number-one hit – and "Reach Out and Touch (Somebody's Hand)". Her second solo album, Everything Is Everything (1970), spawned her first UK number-one single, "I'm Still Waiting". Ross continued her successful solo career by mounting elaborate record-setting worldwide concert tours, starring in highly watched primetime TV specials, and releasing hit albums, such as Touch Me in the Morning (1973), Mahogany (1975), Diana Ross (1976), and Diana (1980), as well as their U.S. number-one pop singles – "Touch Me in the Morning", "Theme from Mahogany (Do You Know Where You're Going To)", "Love Hangover", and "Upside Down", respectively. "Endless Love", a 1981 duet with Lionel Richie, made her the female solo act with the most number-one songs in the United States at the time. Her commercial success continued throughout the 1980s and 1990s with global hits, including "I'm Coming Out", "Why Do Fools Fall in Love", "All of You", "Chain Reaction", "If We Hold on Together", and "When You Tell Me That You Love Me".

Ross has also achieved mainstream success and recognition as an actress. Her first role was her Golden Globe Award-winning and Academy Award-nominated portrayal of Billie Holiday in the film Lady Sings the Blues (1972), becoming the first African-American actress to receive an Academy Award nomination for a debut film performance; she also recorded its soundtrack, which became her only solo album to reach number-one on the U.S. Billboard 200 chart. She also starred in two other feature films, Mahogany (1975) and The Wiz (1978), and later appeared in the television films Out of Darkness (1994), for which she was nominated for a Golden Globe Award, and Double Platinum (1999).

Ross was named the "Female Entertainer of the Century" by Billboard in 1976. Since her solo career began in 1970, Ross has released 25 studio albums, numerous singles, and compilations that have sold more than 100 million records worldwide. She is the only woman artist to have had U.S. number-one pop singles on the Billboard Hot 100 as a solo artist, as the other half of a duet, as a member of a trio, and as an ensemble member, a total of 18. In 2021, Billboard ranked her the 30th greatest Hot 100 artist of all time. Her hits as a Supreme and a solo artist combined put Ross among the top-five artists on the Billboard Hot 100 singles chart from 1955 to 2018.

She had a top 10 UK hit in every one of the last five decades, and sang lead on a top 75 hit single at least once every year from 1964 to 1996 in the UK, a period of 33 consecutive years and a record for any performer. In 1988, Ross was inducted to the Rock and Roll Hall of Fame as a member of the Supremes, and is one of the rare performers to have two stars on the Hollywood Walk of Fame. She was the recipient of a Special Tony Award in 1977, the Kennedy Center Honors in 2007, the Grammy Lifetime Achievement Award in 2012 and 2023 (becoming the first woman to win the award twice, the latter as a member of the Supremes), and the Presidential Medal of Freedom in 2016.