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Two obsessive–compulsive disorder (OCD) genome-wide association studies (GWASs) have been published by independent OCD consortia, the International Obsessive-Compulsive Disorder Foundation Genetics Collaborative (IOCDF-GC) and the OCD Collaborative Genetics Association Study (OCGAS), but many of the top-ranked signals were supported in only one study. We therefore conducted a meta-analysis from the two consortia, investigating a total of 2688 individuals of European ancestry with OCD and 7037 genomically matched controls. No single-nucleotide polymorphisms (SNPs) reached genome-wide significance. However, in comparison with the two individual GWASs, the distribution of
P
-values shifted toward significance. The top haplotypic blocks were tagged with rs4733767 (
P
=7.1 × 10
−7
; odds ratio (OR)=1.21; confidence interval (CI): 1.12–1.31,
CASC8/CASC11
), rs1030757 (
P
=1.1 × 10
−6
; OR=1.18; CI: 1.10–1.26,
GRID2
) and rs12504244 (
P
=1.6 × 10
−6
; OR=1.18; CI: 1.11–1.27,
KIT
). Variants located in or near the genes
ASB13
,
RSPO4
,
DLGAP1
,
PTPRD
,
GRIK2
,
FAIM2
and
CDH20
, identified in linkage peaks and the original GWASs, were among the top signals. Polygenic risk scores for each individual study predicted case–control status in the other by explaining 0.9% (
P
=0.003) and 0.3% (
P
=0.0009) of the phenotypic variance in OCGAS and the European IOCDF-GC target samples, respectively. The common SNP heritability in the combined OCGAS and IOCDF-GC sample was estimated to be 0.28 (s.e.=0.04). Strikingly, ∼65% of the SNP-based heritability in the OCGAS sample was accounted for by SNPs with minor allele frequencies of ⩾40%. This joint analysis constituting the largest single OCD genome-wide study to date represents a major integrative step in elucidating the genetic causes of OCD.