A 200‐item, self‐report personality disorder inventory (Coolidge Axis II Inventory; CATI) was administered to 52 married target subjects. Their spouses and a close friend completed a significant‐other form about the targets. The mean correlation across all personality disorder scales was 0.51 for the targets‐spouses, 0.36 for the targets‐friends, and 0.41 for the spouses‐friends. Twenty‐eight target‐spouse correlations were significant and ranged from 0.99 to ‐.40. The mean correlation for the individual 13 personality disorder scales was 0.46 for target‐spouses and ranged from 0.63 for the histrionic scale to 0.27 for the paranoid scale. The results were interpreted as establishing a basis for significant other assessment of personality disorders.