The current study examined the associations that children's attachment and temperament share with individual differences in jealousy behaviors in early childhood. Previous research has found that secure children display fewer jealousy behaviors than their insecure counterparts, while other research has demonstrated that children with greater activity level and distress to limitations exhibit more jealousy behaviors and affect. In the present study of 83 mother-child dyads (M[subscript age] = 56.92 months), mothers reported their child's attachment security and temperament, and children's behaviors following jealousy-evoking events were observed. The results revealed that as security increased, children were less likely to exhibit externalizing jealousy behaviors, but temperament did not predict jealousy behaviors. These findings support the notion that attachment security is more related than temperament to this aspect of socioemotional development.