High-temperature solar thermal concentrators are the cornerstone of modern Concentrated Solar Power (CSP) systems, enabling the collection and focus of solar radiation to achieve operating temperatures exceeding 500 °C, vital for efficient thermodynamic cycles and dispatchable power generation. This chapter provides a comprehensive overview of the design fundamentals, technological innovations and performance advancements in solar concentrators tailored for high-temperature applications. Key CSP concentrator configurations, including parabolic troughs, central receivers (heliostats), parabolic dishes and linear Fresnel reflectors, are analysed concerning their optical design principles, tracking systems, thermal output and suitability for integration with high-efficiency receivers and thermal storage units. Recent innovations in reflective materials, optical coatings and adaptive structures are highlighted, with special attention to improvements in solar concentration ratio, angular precision and thermal durability. The chapter delves into hybrid designs, novel concentrator geometries and smart tracking mechanisms enhanced by AI, machine learning and real-time control algorithms. Performance benchmarks, techno-economic trade-offs and reliability challenges are discussed using case studies and simulation results from experimental pilot plants and commercial deployments. The chapter concludes with a critical assessment of ongoing research gaps, future directions in lightweight and adaptive optics, and recommendations for next-generation concentrator designs capable of supporting CSP systems operating above 700 °C, including solar thermochemical and supercritical CO₂ applications.