We report the first epigenome-wide association study of left-handedness, a trait with low heritability for which epigenetic mechanisms have been proposed as an underlying etiological mechanism. A region-based meta-analysis of whole blood genome-wide DNA methylation data from two cohorts (3,914 adults) identified differentially methylated regions annotated to BLCAP (20q11.23), a negative regulator of cell growth involved in apoptosis, NNAT (20q11.23), involved in brain development, and IAH1 (2p25.1), which encodes an acyl esterase. CpGs located in proximity to the SNPs from the largest GWAS of handedness were more strongly associated with left-handedness than other differentially methylated positions. In longitudinal whole blood samples, cord blood, and buccal cells from children (N = 1,967), the association with handedness displayed moderate stability across age, but little consistency across cell types. These findings suggest new candidate loci associated with handedness.