The objective of this study is to investigate the effect of conservative working capital policy on profitability and examine the effect of conservative working capital policy on sustainable growth mediated by profitability in the manufacturing sector in Indonesia. This study involves 133 manufacturing firms in Indonesia during the 2013-2018 period. Data are analyzed using panel data regression with random effects estimation models. The result of this study showed that conservative working capital policy, both investment and financing policy, has proven to have a positive effect on sustainable growth rate. Besides, this study also proved that profitability has a positive effect on SGR. Furthermore, there was the effect of conservative working capital policies on the level of sustainable growth through profitability. This study not only contributes to expanding knowledge about the relationship between working capital policies, profitability and sustainable growth rates, but also has relevant implications for firm managers to improve firm performance to be able to grow sustainably.