The All London Green Grid (ALGG) is a policy framework to promote the design and delivery of multifunctional green infrastructure across London in the United Kingdom. Launched in 2011, the framework combines three main elements: (1) green infrastructure-related planning policy contained in the London Plan (the city's masterplan); (2) the ALGG Supplementary Planning Guidance - which provides a more detailed guidance to implement the policies contained in London Plan and serves as a de-facto green infrastructure strategy for London and (3) eleven ALGG Area Frameworks that provide a more detailed assessment of the opportunities for green infrastructure delivery at the sub-local level, in specific areas of London. The design and implementation of the instrument is led by the Greater London Authority in partnership with governmental, private and third sector partners.