GrAPL 2020: Workshop on Graphs, Architectures, Programming, and Learning, brings together two closely related topics - how the synthesis (representation) and analysis of graphs is supported in hardware and software, and the ways graph algorithms interact with machine learning. Driven by the natural outgrowth of a wide range of methods used in large-scale data analytics workflows, GrAPL’s scope is broad. GrAPL’2020 is the second edition of the merger between two successful workshop series at IPDPS: GABB and GraML. GABB started at IPDPS’14 with a program of invited-talks and panel discussions. GraML was held at IPDPS in 2017 and 2018.