North America dominates the Protein Expression and Purification Services market, accounting for ~38% share in 2023. Mature CMO/CDMO ecosystems, NIH–backed funding surpassing US$45bn, and immediate adoption of GMP–grade microbial & mammalian platforms anchor the regional forecast. Europe follows, propelled by the EU’s Horizon Europe biomanufacturing incentives, fast-track ATMP regulatory pathways, and a surge in multi-omics CRO spin-offs; however, fragmented pricing policies temper Protein Expression and Purification Services market growth. Asia Pacific is the fastest-growing region (~14% CAGR) thanks to China’s 14th Five-Year Plan biocluster investments, India’s cost-advantageous biosimilar workforce, and Japan’s expanding CHO-based antibody capacity. Latin America is emerging: Brazil’s ANVISA alignment with ICH standards, aggressive FINEP grants, and rising vaccine self-sufficiency initiatives create pull for outsourced expression services. In Middle East & Africa, Saudi Arabia’s Vision 2030 biotech fund and South Africa’s expanding GMP microbial facilities signal long-term potential, yet infrastructure gaps and talent migration cap near-term upside.