"Da Doo Ron Ron" is a song written by Jeff Barry, Ellie Greenwich and Phil Spector. It first became a popular top five hit single for the American girl group The Crystals in 1963. American teen idol Shaun Cassidy covered the song in 1977 and his version hit number one on the Billboard Hot 100 chart. There have also been many other cover versions of this song, including a version by the Raindrops, which featured the original songwriters of "Da Doo Ron Ron" Jeff Barry and Ellie Greenwich.

The song is the first collaboration in songwriting by Jeff Barry, Ellie Greenwich and Phil Spector. The song was composed over two days in Spector's office in New York. The title "Da Doo Ron Ron" was initially just nonsense syllables used as dummy line to separate each stanza and chorus until proper lyrics could be written, but Spector liked it so much that he kept it. Phil Spector did not want lyrics that were too cerebral that would interfere with a simple boy-meets-girl story line. The rhymes of the opening lines, "I met him on a Monday and my heart stood still ... Somebody told me that his name was Bill" was inspired by Bill Walsh, a friend of Spector who happened to visit Spector while the three were writing the song.

The Crystals recorded "Da Doo Ron Ron" in March 1963 at Gold Star Studios in Los Angeles. It was produced by Phil Spector in his Wall of Sound style. Jack Nitzsche was the arranger and Larry Levine the engineer. The drummer was Hal Blaine.Dolores "LaLa" Brooks was the lead vocalist. La La Brooks told the syndicated radio program Solid Gold Weekend that Cher was one of the singers backing her lead vocals.

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