SYNOPSIS Objective. We do not know which specific paternal caregiving practices are associated with more advanced child development in understudied low- and middle-income countries (LMICs). The current investigation attempts to identify such caregiving practices. Design. Maternal reports of six specific paternal caregiving practices which may be uniquely associated with early childhood development were examined in a sample of 159,959 families with 3- to 4-year-old children from 51 LMICs. Both father caregiving practices and early childhood development scores were quantified using measures from UNICEF’s Multiple Indicator Cluster Surveys. Linear regression models examined which paternal caregiving practices were associated with early childhood development after controlling for the contributions of mothers and children’s other caregivers engaging in the same practices as well as father residence in the home and multiple aspects of the physical home environment and national context. Results. When fathers read to their children, named/counted/drew with their children, or sang to their children, their children demonstrated more advanced overall development. When fathers read, named/counted/drew, and told stories to their children, their children also demonstrated more advanced development in literacy/numeracy and approaches to learning. Some effects depended on whether fathers resided in the home. Fathers naming/counting/drawing with their children was associated with more advanced child development in approaches to learning, and fathers reading to their children was associated with more advanced child socioemotional development only if fathers resided in the child’s home. Conclusions. Fathers reading to their children, naming/counting/drawing with their children, and singing to their children appear to be specific “active ingredients” that promote child development in LMICs. Some of these ingredients only actively promote child development when fathers reside in the child’s home environment. These practices should be supported and encouraged in policy and practice. Fathers’ caregiving matters for child development across a wide swath of LMICs in the world.