We present data on the preliminary validation of a measure of romantic attachmentorientation from the California Adult Q–Sort (CAQ). The CAQ is found in several longitudinal data sets, and researchers can use the CAQ to answer questions about changes in romantic attachment across the lifespan. Expert raters nominated CAQ items that were characteristic of attachment anxiety and avoidance. In a sample of observers and targets, we compared ratings based on composites of these CAQ items to self- and observer-reports from a widely used scale of adult attachment. These expert-generatedmeasures of CAQ-attachment orientation correlated highly with ECR measures ofattachment orientation, suggesting that items from the CAQ can reliably measure an individual’s attachment orientation.