The surprise show will take place in New York City this Monday (November 7), on the eve of the election.
'Bitches Are You In My Gang???' the singer wrote an Instagram post. 'Doing a surprise intimate very small acoustic concert Monday night in support of Hillary. Stay tuned!'
She has yet to announce the gig’s venue or a stage time for her performance.
Madonna endorsed Clinton earlier in the Presidential campaign and showed her support for the Democrat when she introduced Amy Schumer at her recent NYC stand-up gig.
She previously followed Katy Perry’s lead by posting a nude photo on social media to show her support for Clinton.
'Living For Hilary!,' she wrote. 'Yes I vote for intelligence. I vote for equal rights for women and all minorities.'
'She’s the Best we got!' Madonna added. The Presidential election takes place on Tuesday (November 8).
Bitches Are You In My Gang??? Doing a surprise intimate very small acoustic concert Monday night in support of Hillary. Stay tuned! 🎉🎉🎉😂 pic.twitter.com/ZYf8X8aG1A— Madonna (@Madonna) 5 November 2016