ABSTRACT. Objective:There is relatively little research on the childhood antecedent predictors of early-onset alcohol use. This study examined an array of psychosocial variables assessed at age 10 and refl ecting Problem Behavior Theory as potential antecedent risk factors for the initiation of alcohol use at age 14 or younger. Method: A sample of 452 children (238 girls) ages 8 or 10 and their families was drawn from Allegheny County, PA, using targeted-age directory sampling and random-digit dialing procedures. Children and parents were interviewed using computer-assisted interviews. Logistic regression analyses were used to examine the age-10 univariate and multivariate predictors of the initiation of alcohol use by age 14 or younger. Results: Twentyfi ve percent of the sample reported having more than a sip or a taste of alcohol in their life by age 14. Sex, race, and age cohort did not relate to early drinking status. Children with two parents were less likely to initiate drinking early. Early initiation of drinking related signifi cantly to an array of antecedent risk factors (personality, social environment, and behavioral) assessed at age 10 that refl ect psychosocial proneness for problem behavior. In the multivariate model, the variables most predictive of early-onset drinking were having a single parent, sipping or tasting alcohol by age 10, having parents who also started drinking at an early age, and parental drinking frequency. † Correspondence may be sent to John E. Donovan at the above address or via email at: donovanje@upmc.edu. S TARTING TO DRINK ALCOHOL in early adolescence or younger is associated with a greater likelihood of developing both problem drinking in adolescence (Ellickson et al., 2001(Ellickson et al., , 2003Gruber et al., 1996;Hawkins et al., 1997;Horton, 2007;Pedersen and Skrondal, 1998;Warner et al., 2007) and alcohol abuse or dependence in adulthood (DeWit et al., 2000;Grant and Dawson, 1997;Hingson et al., 2006). Early initiation of drinking is also associated with a variety of other problematic outcomes later in adolescence and in young adulthood, including academic problems, dropping out of high school, delinquent behavior, fi ghting after drinking, illicit drug use, prescription drug misuse, substance use disorders, employment problems, risky sexual behavior, pregnancy, unintentional injuries, drinking and driving, and alcohol-and other drug-related motor vehicle crashes (Ellickson et al