Genetic diversity is of paramount importance as a source of novel alleles at loci controlling traits of agronomic importance. Knowledge of genetic diversity in durum wheat cultivars and landraces is a key point for breeders to decide which sources of diversity to integrate in their programs to achieve specific goals. Core collections are an essential tool to dissect and analyse genetic diversity in pre-breeding and breeding materials, and to identify favourable alleles for traits of interest through association mapping. A Global Durum Wheat Panel (GDP) was established through a cooperative effort of durum wheat scientists in the frame of the Expert working group on durum wheat genetics and breeding, part of Wheat Initiative. The GDP was firstly assembled bringing together all genome wide association mapping durum and tetraploid wheat panels currently used worldwide. After refinement, a core subset of 1100 genotypes was selected to constitute the GDP. This panel has been extensively genotyped through the wheat iSelect 90K SNP assay, and the genotype call pipeline allowed to retrieve data for more than 45,000 markers. The dataset firstly obtained was refined to nearly 20,000 unique, nonredundant, single Mendelian SNP markers that were both genetically and physically mapped. The genotypic information allowed us to characterise the GDP for genetic diversity, population structure and genetic relationships. A detailed analysis of the molecular data is presented here. This collection represents a genetic tool of great importance as it has been shared already with 28 breeding partners in 25 countries, and more will obtain it this upcoming season. The combination of genotyping and phenotypic information collected across the Globe will provide a strong tool to identify and exchange useful alleles among breeders.