"We're honoured to welcome the Dalai Lama to Glastonbury 2015," Emily Eavis, the festival's organiser, said in a statement.
"He will be talking in the Green Fields and exploring the farm this Sunday as part of his trip to the UK. What a special moment for the festival!" she said.
Around 135,000 paying ticket holders are expected to attend the five-day Glastonbury gathering, one of the world's biggest music festivals which began in 1970.
The Tibetan spiritual leader will also speak to supporters in the British army base town of Aldershot, which is also in southern England, at the invitation of the Buddhist Community Centre UK (BCCUK).
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Aldershot has a large Nepalese Buddhist community made up mainly of serving and retired Gurkha soldiers who serve in the British army and have been deployed to aid their homeland after a devastating earthquake.
The Dalai Lama already visited Aldershot in 2012.
A small protest is planned in Aldershot by members of the International Shugden Community, a branch of Tibetan Buddhism that reveres a deity denounced by the Dalai Lama since 1996 and which also opposes his claim to be Tibet's spiritual and political leader.