This chapter analyses the relationship between ownership structure and leverage, providing an integrated theoretical approach that combines traditional financial theories, agency theory, and recently developed theories relating to non-financial preferences. The results show that, after controlling for endogeneity, being a family firm has a positive effect on the propensity to incur debt. These findings add to the existing body of literature and underline the need for a multi-theoretical approach when explaining the capital structure of family firms. The authors apply panel data methodology to control for individual heterogeneity of family firms. The chapter uses a sample of Spanish firms operating in the tourism industry.