Crowdsourcing has been claimed to help organisations innovate by leveraging crowd knowledge to generate novel ideas, products and services. The extant literature emphasises external and internal organizational crowdsourcing as strategic efforts toward innovation, highlighting the importance of a comprehensive crowdsourcing strategy for innovation success. However, there is limited knowledge about how to simultaneously manage internal and external crowdsourcing efforts to improve organizational innovation outcomes. Based on a systematic review of the information systems and management literatures on crowdsourcing and innovation, this paper makes a theoretical contribution in the form of an integrated framework of external and internal crowdsourcing factors for innovation from the firm, platform and crowd-level perspectives. Managerial recommendations are then outlined based on these multi-level factors for crowdsourcing innovation success.