"Remember a Day" is a song by the British psychedelic rock band Pink Floyd, written and sung by their keyboardist Rick Wright, appearing on their second album, A Saucerful of Secrets (1968). It was performed live only twice; as an encore in May 1968, and forty years later, in September 2008, by David Gilmour in memory of Wright, who had recently died of cancer. The dreamy, poetic lyrics are about nostalgia for the lost paradise of early childhood.

The song, written and sung by Wright, was recorded during two different sessions. During the first session (May 1967), Wright's vocals, piano, and Farfisa organ were recorded and during the second session (October 1967) Syd Barrett's acoustic and slide guitar as well as the bass and drum sections were recorded at De Lane Lea Studios in London. The sessions also produced "Jugband Blues".

Andrew King, Pink Floyd's manager, recalls: "I remember De Lane Lea... we did 'Vegetable Man' there... and 'Remember a Day', which Syd does a guitar solo on."

In 1968 Barrett wrote: "I was self-taught and my only group was Pink Floyd. I was not featured on 'Corporal Clegg' but did play on another track written by Richard Wright. I forget the title but it had a steel guitar in the background. There have been complications regarding the LP but it is now almost finished and should be issued by EMI in a few months. I now spend most of my time writing."

During the sessions for the song, the band's drummer Nick Mason became agitated that he could not come up with the right drum part. Producer Norman Smith, however, knew what he wanted with the drums, so he played the part himself.

A rare United States single release (Tower 440) contains edited mono versions of this and the song before it in the album, "Let There Be More Light". This single was never released in the United Kingdom, although it was intended to be a single before being replaced by "Apples and Oranges".

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