Grand Slam (rugby union)

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In rugby union, a Grand Slam^[1] occurs when one team in the Six Nations Championship (or its Five Nations predecessor) beats all the others during one year's competition. This has been achieved 42 times in total, for the first time by Wales in 1908, and most recently by the Irish team in 2023. The team with the most Grand Slams is England with 13. It can also apply to the U20 and Women's Six Nations Championships.

In another context, a Grand Slam tour refers to a touring side – South Africa, Australia or New Zealand – which plays fixtures against all four home nations (England, Ireland, Scotland and Wales) during their tour. If the tourists win all of those matches, they are said to have achieved a Grand Slam. This has been done nine times, first by South Africa in 1912–13, and most recently by New Zealand in 2010.