The charity has signed up some of the festival's best-known performers who have painted their faces blue as part of the campaign.
Jarvis Cocker, Little Boots and Fatboy Slim are among the stars who have taken part in the Oxfam photo shoot. The portraits were shot by legendary photographer Rankin and kick off Oxfam's climate change campaign across the festival season.
Oxfam is also asking thousands of festival-goers across the summer to paint themselves blue as part of a visual statement to the UK government to take action on climate change before it's too late.
A video of the celebrity photo shoot will debut on the big screens at the Pyramid Stage during the festival, showing how Rankin captured Oxfam's most ambitious celebrity photo campaign since the famous Make Trade Fair ‘dumping' pictures in 2005.
The blue faces campaign marks Oxfam's sixteenth year at Glastonbury.
The blue faces petition will be presented to the UK government ahead of December's critical climate change summit in Copenhagen, with Oxfam calling for a global deal that keeps carbon emissions at a safe level.