EUV mask blanks market is valued at USD 223.29 million in 2025 and is projected to reach USD 791.69 million by 2034, expanding at a 15.1% CAGR during 2026–2034. The 2026 market level is USD 257.01 million. EUV mask blanks are foundational materials for advanced semiconductor lithography, consisting of ultra-flat low-thermal-expansion substrates coated with dozens of molybdenum/silicon multilayers. Demand rises directly with EUV layer counts, advanced-node wafer starts and the transition toward High-NA EUV.