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Abstract: Background: Mammographic density (MD) is regarded as an intermediate phenotype in breast cancer development. This association study investigated the influence of 14 breast cancer susceptibility loci identified through previous genome-wide association studies on MD among the participants in the “Determinants of Density in Mammographies in Spain” (DDM-Spain) study. Methods: Our study covered a total of 3348 Caucasian women aged 45–68years, recruited from seven Spanish breast cancer screening centres having DNA available. Mammographic density was blindly assessed by a single reader using a semiquantitative scale. Ordinal logistic models, adjusted for age, body mass index and menopausal status, were used to estimate the association between each genotype and MD. Results: Evidence of association with MD was found for variant rs3803662 (TOX3) (Odds Ratio (OR)=1.13, 95% Confidence Interval (CI)=1.03–1.25), and marginal evidence of association for susceptibility loci rs3817198 (LSP1) (OR=1.09, 95% CI=1.00–1.20) and rs2981582 (FGFR2) (OR=0.92, 95% CI=0.84–1.01). Two other loci were associated with MD solely among pre-menopausal women, namely, rs4973768 (SLC4A7) (OR=0.83, 95% CI=0.70–1.00) and rs4415084 (MEPS30) (OR=1.22, 95% CI=1.00–1.49). Conclusions: Our findings lend some support to the hypothesis which links these susceptibility loci to MD. [Copyright &y& Elsevier]