The 1904 British Isles tour to New Zealand and Australia was the sixth tour by a British Isles rugby union team and the third to New Zealand or Australia. It is retrospectively classed as one of the British Lions tours, as the Lions naming convention was not adopted until 1950.

David Revell "Darkie" Bedell-Sivright was a Scottish international rugby union forward who captained both Scotland and the British Isles. Born in Edinburgh, and educated at Fettes College where he learned to play rugby, he studied at Cambridge University and earned four Blues playing for them in the Varsity Match. He was first selected for Scotland in 1900 in a match against Wales. After playing in all of Scotland's Home Nations Championship matches in 1901, 1902 and 1903, Bedell-Sivright toured with the British Isles side – now known as the British & Irish Lions – that toured South Africa in 1903. After playing the first 12 matches of the tour, he was injured and so did not play in any of the Test matches against South Africa.