Spanking is one of the most common forms of child discipline used by parents around the world. Research on children in high-income countries has shown that parental spanking is associated with adverse child outcomes, yet less is known about how spanking is related to child well-being in low- and middle-income countries. This study uses data from 215,885 children in 62 countries from the fourth and fifth rounds of UNICEF’s Multiple Indicator Cluster Surveys (MICS) to examine the relationship between spanking and child well-being. In this large international sample which includes data from nearly one-third of the world’s countries, 43% of children were spanked, or resided in a household where another child was spanked, in the past month. Results from multilevel models show that reports of spanking of children in the household were associated with lower scores on a 3-item socioemotional development index among 3- and 4-year-old children. Country-level results from the multilevel model showed 59 countries (95%) had a negative relationship between spanking and socioemotional development and 3 countries (5%) had a null relationship. Spanking was not associated with higher socioemotional development for children in any country. While the cross-sectional association between spanking and socioemotional development is small, findings suggest that spanking may be harmful for children on a more global scale than was previously known.