Sia (formerly Sia Partners) is a global management consulting firm founded in 1999 in Paris, France, pioneering 'Consulting 4.0' by blending traditional strategy and management consulting with artificial intelligence and design. With roughly 3,000 consultants across about 19 countries, Sia advises clients in energy, financial services, insurance, healthcare and the public sector on strategy, transformation and AI adoption. The firm rebranded from 'Sia Partners' to 'Sia' in early 2025.