This paper investigates knowledge transfer (KT) of human resource management (HRM) across strategic partnerships in the Brazilian automotive industry, and the contextual factors impacting on KT within the supply chain. Case-study research in automotive companies and suppliers in Brazil is used to illustrate how in automotive industries, relationships with suppliers have traditionally been viewed as close, strategic partnerships, but over time, there has been a move towards more attenuated, supply chains, involving a shift towards more remote suppliers for basic components, and arms length relationships with them. In turn, this has impacted on how knowledge on HR has been transferred from manufacturers to suppliers. Both strategic partnerships and KT have been affected by internal drives towards cost cutting and talent retention, and external factors such as global competition through cheap imports, legislation, taxes, and unions. Evidence on the sometimes contradictory attitudes towards KT contributes towards the broader literatures on international HRM and KT in emerging economies, while the gradual unwinding of relationships has implications for policy and practice.Keywords: automotive industry; Brazil; HRM; knowledge transfer; strategic partnerships; supply chains This paper investigates how human resource management (HRM) is transferred within strategic partnerships in the Brazilian automotive industry, and the contextual factors that impact on knowledge transfer (KT) within the supply chain. It draws on case-study research in automotive companies and suppliers in Brazil to illustrate how in this sector, relationships have traditionally been viewed as close, strategic partnerships, but over time, there has been a move towards more attenuated supply chains. In turn, this has impacted on how knowledge has been transferred from manufacturers to suppliers. However, both inter-organizational relationships and KT have been affected by internal drives towards cost cutting and problems with talent retention, and external factors such as global competition through cheap imports and the employment relations system. The inherent, and intensifying, tensions and contradictions in these relationships shed light on how mature inter-firm supply relations and associated partnerships are being reconfigured, and dominant HR paradigms challenged and undermined, by structural changes in the global ecosystem, and the rise of new ultra-low-cost producers in the Far East. The paper focuses on the KT dimension: the sharing of information represents a pooling of knowledge, whilst transfer denotes a more focused passing on of knowledge, The International Journal of Human Resource Management, 2016 Vol. 27, No. 20, 2398-2414, http://dx.doi.org/10.1080/09585192.2016 strategies and processes, with a view to encouraging the promotion and replication of best practices down the supply chain.The paper moves knowledge forward in three main ways. First, it sheds additional light on the nature of relationships within automotive industry supply ...