Conducted 3 studies to validate a French version of the UCLA Loneliness Scale. The correlation between the French and English versions of the scale and the internal consistency and construct validity of the French version were assessed in Study 1, with 178 undergraduate students. Population norms were established in Studies 2 and 3, with 274 mild and severely depressed and nondepressed adults, and the concomitant and discriminant validity and test–retest reliability of the French version were assessed. (English abstract) (PsycINFO Database Record (c) 2016 APA, all rights reserved)