We examined the Drive for Leanness Scale's gender invariance and its relationships with health-related behavior and body image-related drives. Men (N = 342) and women (N = 309) attending British universities completed the Drive for Leanness Scale, Drive for Thinness Scale, Drive for Muscularity Scale, and a demographic inventory. Support for configural and metric, but not scalar, invariance emerged. Drive for leanness was positively correlated with weight training frequency, supplement use, drive for thinness, and drive for muscularity in both genders. Results provide guidance on comparing Drive for Leanness Scale scores across gender and contribute to a coherent understanding of the drive for leanness and its correlates.