"Portsmouth" is a traditional English folk dance tune, similar to an (Irish or Scottish) hornpipe melody. It is sometimes referred to as the Portsmouth Hornpipe.
"Portsmouth" appeared in the 11th edition of John Playford's The Dancing Master in 1701. It is also included in Ralph Vaughan Williams' Sea Songs
In the 1950s it was used as the signature tune for television series of Billy Bunter.
In 1976 English musician Mike Oldfield released his arrangement of "Portsmouth". It is Oldfield's highest charting single in the United Kingdom, charting at number 3. This version is frequently used by football club Portsmouth F.C..