The aim of the current study was to explore the relationships between fat mass and composite indices of femoral neck strength ((compressive strength index (CSI), bending strength index (BSI) and impact strength index (ISI)) in a group of elderly Lebanese subjects. 59 elderly women and 39 elderly men whose ages range between 60 and 85 years participated in this study. Height and weight were measured, and body mass index (BMI) was calculated. Body composition and femoral neck bone mineral density were measured by DXA. Handgrip strength was measured by a hand dynamometer. In women, fat mass was negatively correlated to CSI and ISI. In men, fat mass was negatively correlated to CSI, BSI and ISI. The negative correlations between fat mass and composite indices of femoral neck strength remained significant after controlling for age. In conclusion, the current study suggests that fat mass is a negative determinant of composite indices of femoral neck strength in elderly Lebanese subjects. Implementing strategies to reduce fat mass excess seems important to prevent osteoporotic fractures in elderly subjects.