The International Network for Data on Impact and Government Outcomes (INDIGO) is supported by the Government Outcomes Lab (GO Lab) at the Blavatnik School of Government. INDIGO is a community of peers from different countries, sectors and policy domains with an interest in sharing data about the design, implementation and evaluation of cross-sector collaborations to address complex social problems. INDIGO is structured in three layers: Community, System and Data. More information is available about each layer on the GO Lab website. This INDIGO Data Dictionary 2020 is an essential part of the System and all the datasets in the Data layer.