"Glad All Over" is a song written by Dave Clark and Mike Smith and recorded by The Dave Clark Five. In January 1964, it became the British group's first big hit, reaching No.1 on the UK Singles Chart. In April 1964, it reached No.6 on the American US Billboard Hot 100 chart, becoming the first British Invasion hit by a group other than The Beatles. It was also No.1 in Ireland, No.3 in Australia and No.2 in Canada. It reached No.4 in the Netherlands and No.16 in Germany. "Glad All Over" was the No.2 selling single of 1964 in the UK (behind "Can't Buy Me Love" by The Beatles), and also had sufficient UK sales in November and December 1963 to make it the 58th best-selling single of 1963; put together these statistics suggest UK sales for "Glad All Over" of around 1,000,000 units by the end of 1964.

"Glad All Over" featured Smith leading unison group vocals, often in call and response style, a saxophone line used not for solo decoration but underneath the whole song, and a big, "air hammer" beat that underpinned the wall of sound production known as the "Tottenham Sound".

In 1993, "Glad All Over" was reissued as a single in the UK, coupled with "Good Old Rock 'n' Roll" and "Having a Wild Weekend". The reissue reached No.37 on the UK Singles Chart.

Crystal Palace Football Club adopted the song as their anthem in the 1960s. It is played at the start of all home games, and after full-time (when Palace win). The chorus is played after home goals, after the goalscorer's name is read out. It is also sung by fans as a chant. On Saturday 10 February 1968 The Dave Clark Five played "Glad All Over" live at Crystal Palace's home, Selhurst Park. A cover version, sung by the squad at the time, was released as part of their FA Cup run (where they reached the final of the competition) in 1990.

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