"All by Myself" is a power ballad written and performed by Eric Carmen in 1975.

The verse is based on the second movement (Adagio Sostenuto) of Sergei Rachmaninoff's Piano Concerto No. 2 in C minor, Opus 18. The chorus borrows from the song "Let's Pretend" that Carmen had written for the Raspberries in 1973.

The song was the first release from Carmen's first solo LP after leaving the power pop group the Raspberries and was originally recorded by the author and released in December 1975 to great success. It reached number 2 on the Billboard Hot 100, number 1 on Cash Box Top 100 Singles and number 12 in the UK. The single sold more than one million copies in the United States and was certified gold by the RIAA in April 1976. In a 2006 poll for UK's Five programme Britain's Favourite Break-up Songs Eric Carmen's version of this song was voted seventeenth.

Carmen's original version has spawned numerous cover versions by such artists as Céline Dion, Frank Sinatra, and Igudesman & Joo. It should not be confused with the jazz standard of the same name, written by Irving Berlin and performed by Ella Fitzgerald and others.

By Myself may refer to:

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Céline Marie Claudette Dion, CC OQ, (French pronunciation: [selin djɔ̃] ( listen); born March 30, 1968), is a Canadian singer. Born to a large family from Charlemagne, Quebec, Dion emerged as a teen star in the French-speaking world after her manager and future husband René Angélil mortgaged his home to finance her first record. In 1990, she released the English-language album Unison, establishing herself as a viable pop artist in North America and other English-speaking areas of the world.

Dion had first gained international recognition in the 1980s by winning both the 1982 Yamaha World Popular Song Festival and the 1988 Eurovision Song Contest. Following a series of French albums in the early 1980s, she signed on to CBS Records Canada in 1986. During the 1990s, with the help of Angélil, she achieved worldwide fame after signing with Epic Records and releasing several English albums along with additional French albums, becoming one of the most successful artists in pop music history. However, in 1999 at the height of her success, Dion announced a hiatus from entertainment in order to start a family and spend time with her husband, who had been diagnosed with cancer. She returned to the top of pop music in 2002 and signed a three-year (later extended to almost five years) contract to perform nightly in a five-star theatrical show at the Colosseum at Caesars Palace, Paradise, Nevada.