In terms of capacity the Rungrado May Day Stadium in Pyongyang, North Korea is the largest staduim in the world with a capacity of 150,000. However this is mainly used for association football and cricket.
In terms of rugby, the largest capacity stadium would be:
Melbourne Cricket Ground, Australia. Seating capacity of 100,000. Although primarily used for cricket it has hosted some New South Wales Blues matches along with the Australian National Team.
Telstra Stadium, Sydney, Australia is the largest capacity stadium used solely for rugby league and Aussie Rules at 83,500.
Twickenham, London, England seats 82,000. This is solelyfor Rugby Union. So technically you could say that Twickenham is the largest sole-use Rugby Union Stadium.
also croke park in Ireland holds just over 82,000 and that hosts in ternational and club rugby teams.
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The top ten stadiums used for rugby (and of course are multi - sport now) are;
Melbourne Cricket Ground, Melbourne, Australia - 100,018
Stadium Australia, Sydney, Australia - 83,500
Croke Park, Dublin, Ireland - 82,300
Twickenham Stadium, London, England - 82,000
Stade de France, Paris, France - 81,338
Millennium Stadium, Cardiff, Wales - 74,500
Murrayfield Stadium, Edinburgh, Scotland - 67,130
Ellis Park Stadium, Johannesburg, South Africa - 62,567
Boris Paichadze Stadium, Tbilisi, Georgia - 58,000
Kings Park Stadium, Durban, South Africa - 55,000
There is no one pitch that is the biggest as the IRB rules state that a pitch shall NOT exceed 100 metres goal line to goal line and not exceed 70 metres wide touch line to touch line. The in goal area may not exceed 22 metres