The study is focused on the analysis of the determinants of capital structure of Nigeria companies for 2013. The cross-sectional least squares regression is applied to determine the impact of two independent variables on debt ratio. The independent variables are represented by company size and profitability. It is found that profitability is not a significant determinant and has a negative impact on leverage while the impact of company size was not confirmed in the model. The analysis of the determinants of corporate capital structure has valuable implications for finance managers who can make better capital structure decisions to maximise the wealth of the shareholders.