This article examines the effects of public spending reallocations on economic growth. Assembling a disaggregated public spending dataset of 83 countries over the 1970–2011 period, we show that spending reallocations toward education, from health and social protection, have significant growth‐promoting effects across a wide range of countries' income levels. However, income heterogeneity matters, particularly when reallocations involve infrastructure spending. Specifically, a reallocation from this spending to education also promotes growth, albeit primarily when a country's income level is low. This occurs because the effects of infrastructure spending are particularly weak in low‐income countries, possibly due to the low quality of governance. (JEL O43, H50, O11)