"It's Now or Never" is a popular song recorded by Elvis Presley in 1960. The melody of the song is borrowed from the Italian standard, "'O Sole Mio", but the inspiration for it came from the song, "There's No Tomorrow", recorded by U.S. singer, Tony Martin, in 1949.

In the late 1950s, while stationed in Germany with the U.S. Army, Presley heard Martin's recording and put to tape a private version of the song. Upon his discharge, Presley requested that new lyrics be written especially for him, a job that was undertaken by the songwriting duo of Aaron Schroeder and Wally Gold, with a demo by David Hill.

In 1960, "It's Now or Never" was a number-one record in the U.S. and the UK, where it spent nine weeks at the top, and numerous other countries, selling in excess of 25 million copies worldwide, his biggest international single ever. Its UK release was delayed for some time because of rights issues, allowing the song to build up massive advance orders and to enter the UK Singles Chart at number one, a very rare occurrence at the time. "It's Now or Never" peaked at number seven on the R&B charts .

Barry White heard this song in 1960 when he was in jail for stealing tires. The song had such an impact on White, that it convinced him to pursue a career in music.

A live version featuring "O Sole Mio" is available on the 1977 live album Elvis in Concert. "O Sole Mio" is sung by tenor Sherrill Nielson.

In early 2005, the song was re-released along with the other Presley singles in the UK, and again reached number one on the UK Singles Chart. The song also appears in the TV mini-series Elvis.

American country music singer and actor John Schneider released a cover of the song as his first single and the title track of his debut album. Schneider's version was a Top 5 hit on the BillboardHot Country Singles chart and also peaked at #14 on the BillboardHot 100.