The World Conker Championships (WCC) is a conkers tournament held annually on the second Sunday in October in the county of Northamptonshire, England. Two players use conkers threaded onto a string and take turns to strike the other's nut until it shatters. Players from around the world enter the tournament, competing in a knock-out format in both team and individual formats, with titles for men's, women's and youth categories. Up to 5,000 spectators watch around 400 players participating. from many countries, including Australia, Austria, Canada, France, Japan, Mexico, New Zealand, Poland, Russia, South Africa, Sri Lanka, Ukraine, the United States and the United Kingdom.

Conkers is a traditional children's game in Great Britain and Ireland played using the seeds of horse chestnut trees—the name 'conker' is also applied to the seed and to the tree itself. The game is played by two players, each with a conker threaded onto a piece of string: they take turns striking each other's conker until one breaks.