Work–life balance has important implications for both personal well‐being and work‐related outcomes. This study investigated gender differences in multisource ratings of work–life balance, based on self‐reports and supervisors' appraisals of 40,921 managers in 36 countries. Based on a combination of theoretical ideas from social role theory (Eagly & Wood, 2012), prior work–life literature, and gender egalitarianism as a cultural dimension related to societal gender roles, the study tested gender egalitarianism as a moderator of cross‐national variations in these gender differences. Based on multilevel (HLM) analyses, results showed more cross‐national variation by ratee gender in supervisors' appraisals than self‐reports, suggesting that supervisors' perceptions reflected greater influence of societal gender stereotypes. Supervisors rated women lower in work–life balance than men in low egalitarian countries, but similar to men in high egalitarian countries, and only appraisals of women varied depending on egalitarian context. Country gender egalitarian values explained the majority of variation in supervisors' appraisals of women's work–life balance, whereas women's self‐reported balance was linked to objective gender inequalities. Taken together, the findings show that supervisors' perceptions of employees' work–life balance differed by ratee gender and country context, with important implications for work–life theory and practical implications for global employers.