γ‑Butylrolactone (GBL) is a versatile lactone used as a solvent, polymer precursor, and pharmaceutical intermediate, underpinning critical processes in coatings, electronics, and drug synthesis. The γ‑Butylrolactone market size reached approximately USD 600 million in the base year 2025, and industry analysts project a robust growth outlook with a CAGR of about 5.5 % through the 2026‑2033 market forecast, driven by expanding demand for high‑performance polymers and stricter solvent‑replacement regulations. This overview scopes the global market, covering industrial, pharmaceutical, and polymer applications, and aligns with synonymous terms such as GBL, gamma‑butyrolactone, and butyrolactone derivatives.