The telecoms company, which has held the headline slot since 2012, also sponsors the station's Big Top 40 show.
Alongside activity across Capital’s various channels, Vodafone will partner with Global on its Future Breakers campaign.
Over four weeks Capital FM listeners will vote for their favourite unsigned act to perform at the Summertime Ball in front of 80,000 people.
Alex Conaway, head of brand advocacy, engagement and activation at Vodafone, said: "The partnership has been a huge success with Capital’s Summertime Ball now playing a major role in driving brand engagement for Vodafone.
"This year I’m confident we can build on the great work we’ve already done with Global to make Capital’s Summertime Ball with Vodafone 2016 the most successful yet," he added.
Mike Gordon, chief commercial officer at Global, said: "This is a true partnership that continues to deliver better results year after year. Vodafone is the ideal partner for Capital’s Summertime Ball and I’m delighted they’ve chosen to work with us for another three years."
Vodafone launched its first activation at the event back in 2014, with a number of giveaways, a phone-charging camper van and a branded nail bar in the venue’s VIP area.
The brand also teamed up with Samsung to create the world’s largest human smiley face at Creamfields festival last September.
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