The concept of process maturity suggests that a process has a lifecycle that is assessed by the extent to which it is defined, managed, measured, and controlled. Organisational policies, standards, and structures are institutionalised as organisations increase their process maturity, leading to higher levels of process capability. This concept has been applied to supply chains by researchers through the development of a supply chain maturity model for enhanced supply chain performance. In addition, recent studies have shown that improved supply chain performance can also be achieved by reducing supply chain uncertainty. This paper provides an empirical examination of the relationship between process maturity and uncertainty, along with their impact on supply chain performance. Based on this examination, the paper also provides a framework for supply chain improvement.