George Gershwin (/ˈɡɜːrʃ.wɪn/; born Jacob Gershwine; September 26, 1898 – July 11, 1937) was an American composer and pianist whose compositions spanned jazz, popular and classical music. Among his best-known works are the songs "Swanee" (1919) and "Fascinating Rhythm" (1924), the orchestral compositions Rhapsody in Blue (1924) and An American in Paris (1928), the jazz standards "Embraceable You" (1928) and "I Got Rhythm" (1930) and the opera Porgy and Bess (1935), which included the hit "Summertime". His Of Thee I Sing (1931) was the first musical to win the Pulitzer Prize for Drama.

Gershwin studied piano under Charles Hambitzer and composition with Rubin Goldmark, Henry Cowell, and Joseph Brody. He began his career as a song plugger but soon started composing Broadway theater works with his brother Ira Gershwin and with Buddy DeSylva. He moved to Paris, intending to study with Nadia Boulanger, but she refused him, afraid that rigorous classical study would ruin his jazz-influenced style; Maurice Ravel voiced similar objections when Gershwin inquired about studying with him. He subsequently composed An American in Paris, returned to New York City and wrote Porgy and Bess with Ira and DuBose Heyward. Initially a commercial failure, it came to be considered one of the most important American operas of the 20th century and an American cultural classic.

Gershwin moved to Hollywood and composed several film scores. He died in 1937, only 38 years old, of a brain tumor. His compositions have been adapted for use in film and television, with many becoming jazz standards.

Gershwin's parents were both Jewish immigrants from the Russian Empire. His paternal grandfather, Jakov Gershovitz, was born in Odessa, Russian Empire (now Ukraine), and had served for 25 years as a mechanic for the Imperial Russian Army to earn the right of free travel and residence as a Jew, finally retiring near Saint Petersburg, Russia. Jakov's teenage son, Moishe, George Gershwin's father, worked as a leather cutter for women's shoes. George's mother, Roza Bruskina, was born in Saint Petersburg, Russia.

Moishe met Roza in Vilna, Russian Empire (now Vilnius, Lithuania), where her father worked as a furrier. She and her family moved to New York because of increasing anti-Jewish sentiment in Russia, changing her first name to Rose. Moishe, faced with compulsory military service if he remained in Russia, moved to America as soon as he could afford to (arrived on August 14, 1890). Once in New York, he changed his first name to Morris. Gershovitz lived with a maternal uncle in Brooklyn, working as a foreman in a women's shoe factory. He married Rose on July 21, 1895, and Gershovitz soon Anglicized his name to Gershwine. Their first child, Ira Gershwin, was born on December 6, 1896, after which the family moved into a second-floor apartment at 242 Snediker Avenue in the East New York neighborhood of Brooklyn.

George was born on September 26, 1898, in the Snediker Avenue apartment. His birth certificate identifies him as Jacob Gershwine, with the surname pronounced "Gershvin" in the Yiddish-speaking community. He was named after his grandfather, and, contrary to the American practice, had no middle name. He soon became known as George, and changed the spelling of his surname to "Gershwin" around the time he became a professional musician; other family members followed suit after Ira and George, another boy, Arthur Gershwin (1900–1981), and a girl, Frances Gershwin (1906–1999), were born into the family. The family lived in many different residences, as their father changed dwellings with each new enterprise in which he became involved. They grew up mostly in the Yiddish Theater District. George and Ira frequented the local Yiddish theaters, with George occasionally appearing onstage as an extra.

George lived a boyhood not unusual in New York tenements, which included running around with his friends, roller-skating and misbehaving in the streets. Until 1908, he cared nothing about music. Then, as a ten-year-old, he was intrigued upon hearing his friend Maxie Rosenzweig's violin recital. The sound, and the way his friend played, captivated him. At about the same time, George's parents had bought a piano for his older brother Ira. To his parents' surprise, though, and to Ira's relief, it was George who spent more time playing it as he continued to enjoy it.

Although his younger sister Frances Gershwin was the first in the family to make a living through her musical talents, she married young and devoted herself to being a mother and housewife, thus precluding spending any serious time on musical endeavors. Having given up her performing career, she settled upon painting as a creative outlet, which had also been a hobby George briefly pursued. Arthur Gershwin followed in the paths of George and Ira, also becoming a composer of songs, musicals, and short piano pieces. George studied with various piano teachers for about two years (circa 1911) before finally being introduced to Charles Hambitzer by Jack Miller (circa 1913), the pianist in the Beethoven Symphony Orchestra. Until his death in 1918, Hambitzer remained Gershwin's musical mentor, taught him conventional piano technique, introduced him to music of the European classical tradition, and encouraged him to attend orchestral concerts.