To examine the association of Mediterranean diet (MD) adherence during pregnancy with maternal and neonatal lipid, glycemic, and inflammatory markers. This study included 152 women from the GESTAFIT trial and a subsample of 35 newborns. The Mediterranean Diet Score, derived from food frequency questionnaires, was employed to assess MD adherence. Total cholesterol, high-density lipoproteincholesterol (HDL-C), low-density lipoprotein-cholesterol (LDL-C), triglycerides, and glucose were assessed in the mother (at the 16th and 34th gestational weeks [g.w.]) and in cord arterial and venous serum with standard procedures using an autoanalyzer. Pro-inflammatory and anti-inflammatory cytokines (interleukin [IL]−6, IL-8, IL-10, IL-1beta, interferon gamma, and tumour necrosis factor alpha [TNF-α]) were measured with Luminex xMAP technology. A greater MD adherence was associated with higher HDL-C and lower LDL-C, LDL-C/HDL-C ratio, triglycerides, triglycerides/HDL-C ratio, and TNF-α in the mother at the 16th and the 34th g.w. (|β|: 0.191-0.388, p < 0.05). A higher intake of whole grain cereals, fruits, vegetables and fish and a lower intake of sweets were associated with higher HDL-C and lower LDL-C, LDL-C/HDL-C ratio, triglycerides, triglycerides/HDL-C ratio, and TNF-α at the 16th and 34th g.w. (|β|: 0.188-0.334, p < 0.05). No