Jonathan Charles Bartley is a British politician and was Co-Leader of the Green Party of England and Wales, a position he shared with Caroline Lucas from 2016 to 2018, and then, from 2018 to 2021, with Siân Berry. He was the Green Party's national Work and Pensions spokesperson and the party's Parliamentary candidate for Streatham in the 2015 general election. He was the Unite to Remain candidate for Dulwich and West Norwood at the 2019 general election.
Bartley was a councillor on Lambeth Council representing the St Leonard's ward between 2018 and 2022.
Bartley is the founder and was (until 2016) co-director of Ekklesia, an independent think tank looking at the role of religion in public life and appears regularly on UK radio and television programmes. He is a member of the blues rock band The Mustangs.