Carshalton College is to merge with Kingston College and South Thames College in 2017.
Peter Mayhew-Smith, Principal at Carshalton College, said: "The Corporations of Carshalton College, Kingston College and South Thames College are delighted to announce that they have agreed to merge the three colleges together during 2017.
"This decision reflects the strong partnership work already in place between the three colleges and the resolution of their Governing Bodies to secure ongoing improvement and greater financial resilience for the future.
"The intention is to create an exemplary new college, fit for the twenty-first century and ready to serve the students and businesses of South West London for decades to come. A detailed proposal will follow as part of the consultation process for partners and stakeholders to consider as implementation moves forwards."