Oldest player to appear in a Rugby Union World Cup match
- Who
- Diego Ormaechea
- What
- 40 years 26 days year(s)
- Where
- United Kingdom (Glasgow)
- When
- 15 October 1999
The oldest player to appear in a Rugby Union World Cup match is Diego Ormaechea (Uruguay, b. 19 September 1959), aged 40 years 26 days when he took to the field for Uruguay vs South Africa at Hampden Park in Glasgow, Scotland, UK, on 15 October 1999. Ormaechea was captain and played as a No.8 from the start of the game. Uruguay lost 39–3 to South Africa in what was their final game of the tournament.