This document specifies the big data reference architecture (BDRA). The reference architecture includes concepts and architectural views. The reference architecture specified in this document defines two architectural viewpoints: – a user view defining roles/sub-roles, their relationships, and types of activities within a big data ecosystem; – a functional view defining the architectural layers and the classes of functional components within those layers that implement the activities of the roles/sub-roles within the user view. The BDRA is intended to: – provide a common language for the various stakeholders; – encourage adherence to common standards, specifications, and patterns; – provide consistency of implementation of technology to solve similar problem sets; – facilitate the understanding of the operational intricacies in big data; – illustrate and understand the various big data components, processes, and systems, in the context of an overall big data conceptual model; – provide a technical reference for government departments, agencies and other consumers to understand, discuss, categorize and compare big data solutions; and – facilitate the analysis of candidate standards for interoperability, portability, reusability, and extendibility.