GDMA - Global Data & Marketing Alliance | 442 followers on LinkedIn. GDMA represents, supports and unites marketing associations from around the globe that focus on data-driven marketing. | The GDMA is an organisation that represents, supports and unites marketing associations from around the globe that focus on data-driven marketing. It leads worldwide initiatives aimed at providing marketers with global trends, thought leadership and know-how on data-driven marketing and advertising across all sectors, disciplines and channels. In excess of 30 affiliate organisations are part of GDMA.